KR20040082048A - Color Processing System and Method for Image Display System - Google Patents

Abstract

PURPOSE: A color processing device for an image display device is provided to considerably enhance an optical use efficiency to 3 times. CONSTITUTION: A member of a square rod shape of an optical glass material and square rod members in which an end part of a rod is cut for providing an optical reflection path are overlapped. Two or more selective color transmission and reflection coatings are performed on an optical path, and inter-different colors are formed on a plurality of optical paths. A cylinder-shaped lens performs a lens function in only a direction vertical to a longitudinal direction. Only light of one direction is uniform in a color splitter(74), and the other direction has a little spreading angle to minimize the color mix of light outputted from the color splitter. A color sequence of a fixed color distribution outputted from the color splitter is rearranged using a rotation polygonal rod optical system. For embodying a large-sized image display device, a different partial image is extracted according to respective colors and the extracted image is synchronized with a rotation position of the rotation polygonal rod optical system to re-analyze images.

Description

Color processing system of an image display device {Color Processing System and Method for Image Display System}

The present invention relates to color processing of a video display device used in a video display device, and is an invention used in a large screen video display device.

Referring to FIG. 1, the principle of a beam projector, which is a large-screen image display device, will be described. Light generated by a lamp 1 for generating light is incident on the small image display device 3 through an illumination lens 2. Conventionally, a liquid crystal thin film (LCD) is mainly used as an image display apparatus. The Youngsan signal 4 supplied from the TV line, the PC, or the like forms an image on the small image display device 3 through signal processing in the image processing circuit 5. The formed image forms an image on the distant screen 7 through the projection lens 6. The small image display element 3 is generally configured as shown in FIG. The small image display element 3 has the number of pixels 8 corresponding to the horizontal resolution in the horizontal direction and the number 9 of pixels corresponding to the vertical resolution in the vertical direction. In an enlarged view 10 of an area of the device, one element 11 is composed of a red pixel 12, a green pixel 13 and a blue pixel 14. Accordingly, the white light incident on each pixel has a specific color according to the transmittance of each pixel controlled by the image processing circuit 5. In the color screen display using the display device, as shown in FIG. 3, the original image 15 signal is converted into three basic color images, that is, the red image 16, the green image 17, and the blue image 18. The image is separated by processing, and an image corresponding to each color is applied to each color pixel of Fig. 2, and spatially combined (19) to obtain an original image. However, in this method, as shown in Fig. 2, for a specific color, one third of the entire display area, that is, the red device area, for example, uses only one third of the total color device area. It is disadvantageous. That is, when the screen is full of red images, only the red pixel 12 is turned on and the remaining green pixels 13 and blue pixels 14 are not used, so the light quantity and the number of pixels used are 1/3.

In order to eliminate this problem, as shown in Fig. 4, a method of combining images of each color in the time domain has been developed. In FIG. 4, the images 16, 17, and 18 that are electrically signal-separated in the same manner as in FIG. When the size is small, one color image 21 is recognized according to the averaged recognition of the human eye. A configuration in which this method is implemented will be described with reference to FIG. The white beam emitted from the lamp 22 enters the small image display device 26 through the illumination lens 23 and through the color selection device 24 through the focusing lens 25. The image signal 4 input from the outside is displayed as a visual image on the small image display element 26 via a dedicated image processing circuit 27. The image processing circuit 27 sequentially outputs an image of each basic color as shown in Fig. 4 through signal processing of the input image signal 4. As the small image display device 26 used in this manner, a reflection type rather than a transmission type is typically used due to problems such as a response speed of the display element. The light reflected by the small image display device 26 through the above process forms an image on the large screen 29 through the projection lens 28. As the color selection device 24, a color wheel 30 shown in Fig. 6 is mainly used. The color wheel 30 is composed of a red transmission area 31, a green transmission area 32 and a blue transmission area 33 in a basic configuration. The color wheel 30 is attached to the rotary motor 34 and rotates, and the color wheel is used to supply the angular position of the color wheel according to the rotation of the motor, that is, the currently operating color information to the signal processing circuit 27. There is a position marker 35 of a predetermined angular interval inside the recognition sensor 36 for detecting this marker is a position signal 37 in the form of an electrical pulse 38 when the position marker 35 passes by the position of the sensor. ) The output position signal 37 is supplied to the signal processing circuit 27 and used to synchronize the color wheel color position with the image.

Fig. 7 shows the color transmission characteristics of each area of the color wheel. In the red transmission region 31 of the color wheel, the red light wavelength 39 is transmitted, the green transmission region 32 transmits the light of the green wavelength region 40, and the blue transmission region 33 transmits the light of the blue wavelength region 37. Referring to Fig. 8, the operation principle of the color selection by the color wheel 30 will be described. In the region 43 where the white light 42 coming out of the light source and incident through the illumination lens meets the color wheel 30, Only the light 44 of the color corresponding to the transmission wavelength of the region is transmitted. Light 44 of transmitted color is incident on the image display device 26 via the focusing lens 25. Accordingly, light of three colors is incident on the image display device 26 at a constant speed as the color wheel rotates at a constant speed. A synchronous method using this method is described in FIG. The light incident on the image display device 26 as the color wheel 30 rotates at a constant speed, and the red section 44 is red, the green section 45 is green, and the blue section 46 is blue. Appears sequentially. In the red section 44 where red light is incident on the small image display element 26, the red image of FIG. 4 is output to the small image display element 26. Accordingly, the image output on the large screen 29 of FIG. 5 becomes a red image. In the same manner, the green image 17 and the blue image 18 of FIG. 4 are sequentially displayed when the sections 48 and 49 respectively correspond to each other, and the recognition sensor of FIG. 6 for position synchronization between the image and the color wheel. The position signal 38 output from 36 is used. The signal processing circuit 27 for such signal processing will be described with reference to FIG. The image signal 4 input from the outside is decompressed, demodulated, and discretized by the preprocessor 50 and input to the digital signal processor 51 to adjust the image size, color, and remove gamma components of brightness. The removal process is input to the color space separator 52. The color space separator 52 separates data for each color from the input signal and stores the data in the image memory memory 53 for each of red (54), green (55), and blue (56). The image stored in the image memory memory 53 is synchronized with the position signal 37 of the color wheel, and the data flow controller 57 extracts an image of the color synchronized with the current color of the color wheel from the image memory memory 53. Through the small image display element driver 58, the image is output as a visible image to the small image display element 26 by the action of the small image display element driver 58.

In the method using the conventional color selection color wheel 30 shown in Fig. 5, there is a problem of low light utilization efficiency. Referring to the specific case illustrated in FIG. 11, when the white light 59 incident on the color wheel 30 passes through the red region 60 of the color wheel, only the red light 61 is transmitted to be used for display. The blue and green light 62 is reflected and not used. That is, when the energy distribution of each color is the same in white light, only one third of the total light is used. This case also occurs in the green and blue regions of the color wheel. In order to solve the problem of low light utilization efficiency of the conventional method, the present invention has implemented a color processing device to significantly increase the light utilization efficiency up to three times. In a large screen display device, light utilization efficiency is a major factor in the final performance of the product and the price determination of the product.

1 is the principle of the beam projector

2 is a structure of a color LCD plate

3 is a color image formed by spatial combination of color images

4 is the formation of color projection by temporal combining of color images

5 is a configuration example of a projector using a color separator

6 is an example of a color separator using a color wheel method.

7 is a wavelength-specific transmission characteristic of the color filter of the color wheel

8 is an operation example of a color wheel

9 is a synchronization example of a color wheel and an image display device;

10 is a conventional signal processing configuration

11 is a color transmission characteristic of the color wheel

12 is a configuration of the present invention

13 illustrates an operation of a light focusing lens

14 is a configuration example of a color separator

15 is a configuration example of a color separator intermediate member

16 is a configuration example of a color filter

17 illustrates reflection characteristics of a color filter

18 illustrates an example assembled color separator.

19 illustrates operation of an example color separator.

20 is an example color output

21 is a configuration example of a color scroller

22 is a configuration example of a rotating hexagonal bar

23 is a color scroll of the illustrated hexagonal bar

24 shows color arrangement on a screen display element

25 shows the color scrolling on the screen display element.

26 is a color separation image

27 is a synthesis of color images.

28 is a signal processing configuration example

29 is a display example of a large screen image

30 is another configuration example of a color separator

<Explanation of symbols for main parts of drawing>

70: lighting lamp 74: color separator

78: rotating hexagon bar for colored scrubs

130: total reflection prism 79: screen display element

Degree. Referring to 12, the present invention is a light source of the lamp 70, the white light 72 coming out of the lamp 72, the heat blocking filter 81 to block the heat of the lamp, a specific direction component of the focused light from the lamp (75) parallel light form A cylindrical lens 73 for converting light into a color, a color separator 74 for separating the color of incident white light into three primary colors, a focusing lens group 75 for converting light into a parallel light shape, and converting a color configuration order of light A hexagonal color scroller (76), a connection lens (77) for collecting light from the color scroller, a mirror (78) for deflecting the light propagation direction, a small image display device (79) for displaying an image, and And a projection lens 80 for projecting light from the small image display element onto a large screen.

The color separator 74 is described with reference to Figs. 13 to 20. In this configuration, the horizontal direction 75 of Fig. 13 illustrating the installation direction of the color separator is a horizontal scan of the small image display element 79. The vertical direction 76 corresponds to the direction perpendicular to the horizontal scanning direction of the small image display element. The cylindrical lens 73 positioned at the front of the color separator 74 is installed so that the longitudinal direction of the lens is in the horizontal direction 75. Therefore, in the light incident on the cylindrical lens 73, the component in the horizontal direction 75 transmits without the effect of the lens, and the component in the vertical direction 75 receives the refraction corresponding to the refractive ability of the lens. When the light passes through the lens, the light becomes almost parallel light. By this action, the light component in the horizontal direction 75 enters the color separator at a large angle output from the lamp 70, and the light component in the vertical direction 76 is almost parallel by the cylindrical lens 73. Is incident on the color separator 74. Therefore, the horizontal direction 75 causes multiple reflections inside the color separator 74 due to the large spreading angle, so that the brightness appears to be uniformly diffused when the color separator exits the color separator. On the other hand, the vertical component 76 enters the color separator in a substantially parallel state and thus passes through the color separator at a small spread angle with little interaction with the color separator. As a result, the light in the horizontal direction 75 component of the color separator corresponding to the horizontal scanning direction of the small image display device 79 is uniform in brightness, and finally, in the horizontal scanning direction of the small image display device 79. Supply uniform light. In addition, the light in the vertical direction 76 may minimize the spreading angle, thereby minimizing mixing between lights having different colors when light is output from the color separator 74.

The color separator is composed of an intermediate member 79 in the form of a rectangular parallelepiped rod and an upper surface member 78 and a lower surface member 90 in the form of a rectangular parallelepiped, one side of which is cut at an angle of 45 degrees, as illustrated in FIG. They are processed with an optical glass material that is transparent to visible light. The intermediate member 79 illustrated in FIG. 14 is a right triangular column 91, a triangular column 92 having two slopes at an angle of 45 degrees, and a rectangular parallelepiped rod 93 cut in a 45 degree direction as shown in FIG. The three parts are assembled. The intermediate member 79 thus formed is formed with a portion of the blue reflective coating film 94 that reflects blue light and transmits light of different colors, and a red reflective coating film 95 that reflects red light and transmits other light. The optical properties of the coating film are illustrated in FIG. 17, and the blue reflective coating film 94 reflects light of the blue light wavelength as shown in FIG. 17A, the remaining light is transmitted, and the red reflective coating film ( 95) may have a property of reflecting light of a red light wavelength as illustrated in FIG. 17B. Fig. 18 shows the assembled shape of the color separator 74 described above. The operation of the color separator illustrated in Fig. 19 has been described. When the white light 97 incident on the color separator 74 meets the blue reflective coating film 94, the blue component 99 reflects over the light path and passes through the upper surface member 78. The and green components pass through the blue reflective coating film 94 to meet the red reflective coating film 95. In the red reflective coating layer 95, the red component 100 of the light passes through the lower surface member 90 by reflecting down the optical path. When the red component is reflected, only light of the green component 101 remains, and the component passes through the red reflective coating film 95 and passes through the intermediate member 79. By this operation, light having the color distribution shown in FIG. 20 is output to the color separator output terminal 102.

Fig. 21 illustrates the connection of the color separator 74 and the screen display device 79. Light whose color is separated from the color separator 74 is converted into a substantially parallel light state by the connection lens group 75, and then through a hexagonal rod 76 made of a transparent optical glass material, which has a rotatable structure. The light is focused again by the focusing lens group 77 and totally reflected at the inner boundary 104 of the total reflection prism 103 to reach the small image display device 79. The light 105 reflected by the small image display device is incident to the total reflection prism 103 and reaches the inner boundary 104 of the prism. However, while the light incident on the small image display device 79 is inclined with respect to the normal of the surface of the small image display device, the reflected light comes out to coincide with the normal of the surface of the small image display device 79. The light has an angle of incidence smaller than incident light with respect to the inner boundary plane 104 normal of the total reflection prism 103. At this time, since the angle is formed so that the incident light totally reflects the incident light and transmits all the reflected light, the reflected light passes through the internal boundary 104 and exits the total reflection prism 103.

Fig. 22 illustrates the structure of a hexagonal bar 76 used as a color scroller. Referring to the drawings, the hexagonal bar 76 is assembled to the rotary shaft of the rotary motor 106, the disc 107 is assembled to the hexagonal bar, the disc 107 is the position marker 108 at regular intervals Formed. When the position mark 108 passes through the recognition sensor 109, a signal 110 having an electrical pulse 111 is output from the recognition sensor 109. The output signal 110 can be used to know the current angular position on the hexagonal bar, and the image signal processing can be synchronized to the hexagonal bar location using the output signal 110. Fig. 23 illustrates the rearrangement of the output color according to the rotation of the hexagonal bar. In Fig. 23, R means red light, G means green light and B means blue light. In the figure, when the hexagonal bar is in the initial position (a), since the light meets perpendicularly to one side of the hexagonal bar, the light goes straight, so the RGB arrangement is the same for input and output. When the hexagonal bar is rotated by a certain angle (c), the red light is refracted down by Snell's law that meets one side 112 of the hexagonal bar and calculates the amount of refraction of light, and proceeds inside the hexagonal bar, It is refracted at 114 to exit the hexagonal bar. Here, the incident surface 112 and the exit surface 114 are parallel to each other, so that the light incident on the incident surface 112 and the light exiting from the exit surface 114 have the same angle. On the other hand, the blue and green light that meets the other surface 113 of the hexagonal bar refracts upward compared to the incident light, passes through the hexagonal bar, and exits the hexagonal bar from the exit surface 115. In this case, since the incident surface 113 and the exit surface 115 are parallel to each other, the incident light and the transmitted light have the same angle. In this way, in the case of Fig. 23 (c), the output color arrangement of the hexagonal bars 76 is in GBR order. When the hexagonal bar is rotated by a certain angle (e), the color arrangement becomes BRG by the same principle. In other words, the color of the light output from the hexagon rod scrolls as the hexagon rod rotates. Degree. 23 (b), (d), and (f) are intermediate steps of (a), (c) and (e) respectively. Degree. As can be seen in the example of 23, as the hexagon bar 76 rotates, the color of the light exiting the hexagon bar continuously repositions, i.e., scrolls.

Degree. Referring to FIG. 21 again, the color-relocated light output from the hexagonal bar 76 forms an image on the small image display device 79 through the focusing lens group 77 and the total reflection prism 103. Degree. 24 shows a color arrangement formed in the small image display element 79 according to each position of the hexagonal bar 76 of FIG. As can be seen in the example, the rotation of the hexagonal bar. As shown in FIG. 25, the small image display element 29 continuously displays a color arrangement scrolling 116. Here, a red starting line 117 is used as a reference position for recognizing the current color distribution, which is illustrated in FIG. 22 may be implemented as a suitable arrangement of the position recognition mark 108 and the recognition sensor 109. That is, for example, the position marker 108 and the recognition sensor 109 is a rotating hexagonal bar (76). When arranged to meet each other when in the position of 23 (a), by rotating the hexagonal bar at a constant speed, it generates a pulse when the hexagonal bar passes the initial position (Fig. 23 (a)), and the pulse The position of the reference line 117 can be continuously estimated in consideration of the time distance from the time of occurrence and the rotational speed of the hexagonal bar 76.

Degree. 26 to .28 illustrate an image processing method for the above color scrolling method. Degree. As shown in FIG. 26, the original image 118 is divided into three primary colors images of the red image 119, the red image 120, and the blue image 121, and is resynthesized in the same manner as shown in FIG. . Referring to FIG. 27, the partial image 122 to be used in the red image 119 and the partial images 123 and 124 to be used in the green image 120 using the start line 117 designating the start of the red signal. Then, the partial images 125 to be used in the blue image 121 are extracted and synthesized into one image to form a resynthesized image 126, which is displayed on the small image display device 79. In this manner, different color distributions are continuously generated as the hexagonal rod 76 rotates, and the synthesized image 126 is continuously changed by synchronizing the partial image portions extracted from the color images 119, 120, and 121 in synchronization with this. By forming a composite image on the small image display device 79. By this synchronization method, when the time when the next synthesized image is formed from one synthesized image is smaller than the minimum recognition time of the human, the small image display device 79 causes the optical illusion that the original image 118 is formed. .

Degree. 28 exemplifies a signal processing method capable of implementing the above signal processing. Degree. Referring to FIG. 28, the externally input image signal 127 is decompressed, demodulated and discretized by the preprocessor 128 and input to the digital signal processor 129 to adjust the image size, color, and brightness. The gamma removal process for removing the component is input to the color space separator 130. The color space separator 130 separates data for each color from the input signal and stores the image for each of the red 132, the green 133, and the blue 134 in the image memory memory 131. Using the position signal 110 inputted from the position detection sensor 109 of the hexagonal bar, the start position generator 135 of the partial color image for each color determines the use area for each color, and the areas are stored from the image memory memory 131. The image is synthesized by transmitting to the image synthesizer 136. The synthesized image signal is input to the small image display element driver 137, and the image signal is output as a visible image to the small image display element 79 by the action of this driver. The visible image displayed on the small image display device 79 is projected onto the large screen display screen 140 through the projection lens 139 through the total reflection prism 130 as illustrated in FIG. ) Is displayed enlarged on the large screen (140).

Solving the problem of low light utilization efficiency of the conventional method, there is an effect that can significantly increase the light utilization efficiency up to three times.

Claims (5)

A plurality of optical path providing structures manufactured by overlapping rectangular bar-shaped members made of an optical glass material and rectangular bar members cut at an end of the rod at an angle to provide a light reflection path; Applying at least two selective color transmissive and reflective coatings on the optical path to form different colors in the plurality of optical paths; A cylindrical lens, which does not act as a lens in the longitudinal direction but acts as a lens only in a direction perpendicular to the length, is used in front of the color separator so that only one light is uniform inside the color separator and the other Has a small spread angle to minimize color mixing of light output from the color separator; A color scroll structure for rearranging the color order using a rotating polygon rod optical system with a fixed color distribution output from the color separator; A signal processing structure for reconstructing an image by synchronizing with a rotational position of the rotating polygonal rod optical system by extracting a partial image for each color to implement a large image display device using the above structure; And a front projection image display device or a rear projection projection television configured to form an image formed on a small image display element on a large screen with the above structure. The horizontal scanning line direction of the small image display device according to claim 1, wherein a lens or lens system having a lens effect only in a specific direction is formed in front of the color separator in order to obtain a uniform light distribution in the horizontal scan line direction of the small image display device. The light has a wide emission angle so that the light quantity distribution is uniformized by multiple reflection of the light inside the color separator, and the light is close to parallel light in the direction perpendicular to the horizontal scanning line of the small image display device. A color processing apparatus for a video display device, characterized in that color mixing with adjacent colors does not occur when exiting, and a plurality of color filters are inserted and integrated on the light passage to facilitate component management and fabrication. The method according to claim 1, wherein a polygonal rod made of optical glass, which enables color repositioning, is attached to the rotating motor shaft, and a position tag is attached to the rod or the motor to recognize the rotation angle position of the rod, and recognized by the recognition sensor. And outputs an electrical pulse according to a position and inputs it to a signal processing circuit, thereby synchronizing the color rearranged by the hexagonal bar and the image output from the image signal processing circuit to each other. . The method of claim 1, without using a device of rectangular cross section to separate colors. By using a plurality of plate-shaped color filters as in the example of 30, using a plurality of plate-shaped mirrors to separate the light into a plurality of colors, and converting the separated light into almost parallel light, the above paragraph 1 The color processing device of the video display device, characterized in that to enable the operation. The method according to claim 1, wherein in order to apply the structure to the LCD image display device using a change in polarization, instead of using a total reflection prism, a large-screen image display device is implemented using a polarization-dependent transmission optical system. Color processing unit.