JP4487584B2 - Projection-type high-definition image display device - Google Patents

Description

  The present invention relates to a projection-type high-definition image display device, and more particularly to a projection-type high-definition image display device for displaying an ultra-high-definition image using four high-definition image display elements.

  For example, when displaying an ultra-high-definition image, for example, when displaying an ultra-high-definition image of 4000 pixels in the horizontal direction and 2000 pixels in the vertical direction, or when displaying at full resolution, a display element of horizontal and vertical 4000 × 2000 pixels (For example, refer nonpatent literature 1).

  In addition, by using four horizontal and vertical display elements of 4000 × 2000 pixels, two of them are used for displaying a green component, and they are shifted by 1/2 pixel in the horizontal and vertical directions. A display device that simply covers a display area of 8000 × 4000 is also realized (for example, see Non-Patent Documents 2 and 3). If this method is used, an apparatus that covers a display area of 4000 × 2000 can be realized by disposing two horizontal / vertical 2000 × 1000 pixel display elements shifted by 1/2 pixel in the horizontal and vertical directions.

Others that display high-definition images have been proposed (see, for example, Patent Documents 1, 2, 3, 4, 5, 6, and Non-Patent Documents 2 and 3).
Japanese Patent Application Laid-Open No. 5-122713 "Projection Type Liquid Crystal Image Display Device" Japanese Patent Laid-Open No. 5-150208 “Liquid Crystal Projector Device” Japanese Patent Laid-Open No. 5-150212 "Liquid Crystal Projector" Japanese Patent Laid-Open No. 5-323271 “Projector Device” JP-A-8-172591 “Projector Device” JP-A-11-295650 “Projection Display Device” http://www.jvc-victor.co.jp/press/2003/d-ila.html Kanazawa et al. “Development of Ultra High-Definition Video System” The 9th VMA Research Meeting of the Institute of Image Electronics Engineers of Japan, pp. 6-11, 2002 Hamada et al. “Ultra high definition video display device with 4000 scanning lines Image shift method and convergence correction” IEICE Technical Report, EID2002 30-36, pp. 13-16, 2, 2002

  However, an element for displaying an ultra-high-definition image such as 4000 × 2000 pixels at full resolution as described above has a larger element size than an element such as 2000 × 1000 pixels that is equivalent to an HDTV. In addition, thinning is required for processes such as wiring, and the manufacturing cost becomes four times or more expensive.

  The methods according to Patent Document 1 and Patent Document 4 described above are pixel shifts in only one direction (vertical direction), and the sense of resolution is not improved more than the number of pixels of the display element in the horizontal direction.

  Further, Non-Patent Document 2 shows a case in which red, green, and blue are shifted by ½ pixel in the horizontal and vertical directions using six display elements, each of red, green, and blue (Non-Patent Document 2). The effect of the method B) shown in FIG. 4 and the case of shifting only ½ pixel in the horizontal and vertical directions only for green using a total of four display elements, one each for red and blue and two for green (non-patent document) There is a description about the effect of the method C) shown in FIG. 2, and in the document, there is a projection type high-definition image display device configured by four display elements shifted only in green, assuming that the method B and C have almost the same effect. It has been realized. In the evaluation experiment result shown in FIG. 1 of Non-Patent Document 2, the evaluation result that is regarded as the same effect is very slight, but the method B is superior. This is because the green element is increased as the fourth display element in the configuration of the fourth sheet of the method C, so that the resolution feeling is improved by the luminance component included in the red and blue components of the six-configuration of the method B. This is thought to be due to the disappearance of.

  Further, in the projection-type image display device of Non-Patent Document 2, since the pixel shift is performed only in the oblique direction, the number of pixel center positions by each display element on the projection plane is only twice the number of pixels of the display pixel. not exist.

  The present invention has been made in view of the above points, and an object thereof is to provide a projection-type ultra-high-definition image display device using four display elements that are inexpensive and capable of displaying a high-definition image. To do.

FIG. 1 is a principle configuration diagram of the present invention.

The present invention is a projection type high-definition image display device that modulates light emitted from a light source on the front or back of a screen by four matrix type display elements A, B, C, and D and forms an image on the screen. And
A first matrix type display element A for displaying a first color component red;
A second matrix type display element B for displaying the second color component green;
A third matrix type display element C for displaying a third color component blue;
A fourth matrix type display element D that displays a luminance (white) component or a color component that includes more luminance components than the green component as a fourth color component ;
For the first projected onto cleans display position of the fourth each matrix type display device, an orthogonal spatial coordinate x on the screen in units of image pitch of the projected image, with respect to y,
In order to double the number of pixels on the projection surface in the horizontal and vertical directions,
The display position of the first matrix type display element A is set to x direction + 1/4 · y direction + 1/4,
The display position of the second matrix type display element B is set to x direction-1 / 4 · y direction + 1/4,
The display position of the third matrix type display element C is set to x direction + 1/4 · y direction-1 / 4,
The positions of the first to fourth matrix display elements are adjusted so that the display position of the fourth matrix display element D is obliquely shifted by x direction-1 / 4 and y direction- 1 / 4. Position control means.

In the present invention , a microlens is arranged for each pixel of each matrix type display element, or a reflection part of each pixel of each matrix type display element is used as a concave mirror and projected onto the screen. The light is condensed at the center position of each pixel.

The present invention further includes color component calculation processing means,
The color component calculation processing means includes
The first, second, and third color components and the brightness (white) that are display colors of each display element from the luminance component Y and the color difference components U · V or the three primary colors R ′, G ′, and B components of the input image signal. ) component, or the number of luminance components than the green component corresponding to including the fourth color component, Ru determined by arithmetically processing the display data of each pixel of the display elements.

The present invention further includes a reduction calculation processing means,
The reduction calculation processing means is
The reduction filtering centered on the pixel values of the input image signal at a position corresponding to the display position of each pixel to be projected from the display elements, Ru obtains display data for each pixel of each display element.

  The present invention further includes color component change control means for changing the color components of the four display elements in the time direction.

  As described above, the present invention can realize a device that displays an ultra-high-definition image of 4000 × 2000 pixels using four inexpensive high-definition display elements of 2000 × 1000 pixels. The manufacturing cost of the fine image display device can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 2 shows an image by the display element on the projection surface in the first embodiment of the present invention.

  In the figure, an image by a display element (4 horizontal pixels and 3 vertical pixels) on the projection surface is shown, and one pixel of the display element and the center of the pixel are shown. For simplicity, the shape of the display pixel is a square, but it may be a rectangle.

FIG. 3 shows a display position by the fourth display element in the first embodiment of the present invention.

  In the figure, the image display position of the fourth display element D is ½ pixel in the horizontal direction and the vertical direction with respect to the image display positions of the first, second, and third display elements A, B, and C, respectively. A state where the display is shifted by the pitch is shown. Here, when the first, second, and third display elements display red, blue, and green color components, the fourth display element is white or a color component that includes more luminance components than green.

FIG. 4 is a block diagram of the optical system inside the projection type image display apparatus according to the first embodiment of the present invention.

  The projection type image display apparatus shown in FIG. 1 includes a light source 10, a lens 11, a plurality of mirrors 12, a plurality of half mirrors 13, a plurality of PBSs (Polarizing Beam Splitter) 14, a plurality of combining prisms 15, and first to fourth. It consists of display elements A, B, C and D.

  The light (white light) output from the light source 10 is guided to the four display elements A, B, C, and D with light wavelength components corresponding to the respective display colors using the mirrors 12 and 13 and the PBS 14. These are again synthesized by the synthesis prism 15 and projected onto the screen via the lens 11.

Display device A in the projection image display apparatus, B, C, by the positioning and D, the display from the display elements will be guided as shown in FIG.

  According to human visual characteristics, among red, blue and green, green is closest to the luminance component and has high spatial resolution. However, higher brightness and spatial resolution can be obtained by using white, which is a brightness component, than green. As described above, when the fourth display element is a white color or a fourth color component containing more luminance components than green, a higher luminance and resolution feeling can be obtained.

  Further, the projection positions of the display elements A, B, C, and D are adjusted at the time of assembling the projection type image display device and fixed completely, or at least three other than the reference display element. A method is conceivable in which a position control mechanism is provided on the display element so that the display element can be adjusted at any time after the display device is assembled.

The display elements A, B, C, as a position adjusting method D is provided with a position control mechanism by a piezoelectric element or a stepping motor or the like as shown in FIG. 5 (a), the crosshairs and grid from the display elements on the screen The pattern is displayed, the length of the position control mechanism attached to the horizontal / vertical position with respect to the element is adjusted, and the display positional relationship with the reference display element is measured or automatically calculated and adjusted.

For example, from the state shown in FIG. 5 (a), the by changing the length of the vertical position control mechanism as in FIG. 5 (b), to adjust the display position in the vertical direction, FIG. 5 (c The horizontal position can be adjusted by changing the length of the horizontal position control mechanism as shown in FIG. 5 ), or a plurality of horizontal and vertical position control mechanisms can be used as shown in FIG. By making the amount of change in the lengths nonuniform and non-uniform, it is possible to correct the position in the rotational direction.

[Second Embodiment]
FIG. 6 shows the display screen position on the projection plane in the second embodiment of the present invention. In the figure, the display screen positions by the display elements A, B, C, and D are displayed with a shift of ¼ pixel pitch with respect to the center of the projection screen.

FIG. 7 shows an image by the display element on the projection surface in the second embodiment of the present invention. When viewed at the center of the pixel of each display element, the display on the projection plane is a mosaic arrangement of four display elements as shown in FIG.

The configuration of the projection type image display apparatus in the second embodiment is the same as that of the first embodiment described above. As shown in FIG. 4 , the light source 10, the lens 11, the plurality of mirrors 12, and the plurality of halves. The mirror 13, a plurality of PBSs (Polarizing Beam Splitters) 14, a plurality of combining prisms 15, and first to fourth display elements A, B, C, and D are configured.

  The light (white light) output from the light source 10 is guided to the four display elements A, B, C, and D with light wavelength components corresponding to the respective display colors using the mirrors 12 and 13 and the PBS 14. These are again synthesized by the synthesis prism 15 and projected onto the screen via the lens 11.

Display device A in the projection image display apparatus, B, C, by the positioning and D, the display from the display elements will be guided as shown in FIGS.

  According to human visual characteristics, among red, blue, and green, green is closest to the luminance component and has high spatial resolution. However, higher brightness and spatial resolution can be obtained by using white, which is a brightness component, than green. As described above, when the fourth display element is a white color or a fourth color component containing more luminance components than green, a higher luminance and resolution feeling can be obtained.

  Further, the projection positions of the display elements A, B, C, and D are adjusted at the time of assembling the projection type image display device and fixed completely, or at least three other than the reference display element. A method is conceivable in which a position control mechanism is provided in the display element so that the display element can be adjusted as needed after the display device is assembled.

The position adjusting method of the display elements A, B, C, D, the position control mechanism by a piezoelectric element or a stepping motor or the like as shown in the aforementioned FIGS. 5 (a) is provided, the crosshairs from the display elements on the screen The grid pattern is displayed, the length of the position control mechanism attached to the horizontal and vertical positions with respect to the element is adjusted, and the display positional relationship with the reference display element is measured or automatically calculated and adjusted.

For example, from the state shown in FIG. 5 (a), the by changing the length of the vertical position control mechanism as in FIG. 5 (b), to adjust the display position in the vertical direction, FIG. 5 (c The horizontal position can be adjusted by changing the length of the horizontal position control mechanism as shown in FIG. 5 ), or a plurality of horizontal and vertical position control mechanisms can be used as shown in FIG. By making the amount of change in the lengths nonuniform and non-uniform, it is possible to correct the position in the rotational direction.

  Although not as green, red and blue also contain luminance components. For example, not only the green of the fourth element but also the red and blue display elements are shifted horizontally and vertically, respectively, so that the number of pixel center positions by each display element on the projection plane is Four times the number of pixels, and a higher resolution can be obtained.

[Third Embodiment]
In this embodiment, an example in which each matrix type display element is arranged so as to collect light at the center position of each pixel projected from each matrix type display element will be described.

8 to 10 are examples in which light is condensed at the center of the pixel of each display element in the third embodiment of the present invention. As shown in the figure, by attaching a microlens array 20 corresponding to each pixel of the display element 30, it is possible to collect light at the center of the pixel of each display element 30.

Further, in the case of the reflective display element 40, as shown in FIG. 9 , the light can also be condensed by using a reflecting mirror for each pixel of the reflective display element as a concave mirror.

Further, when the light is condensed at the center of each pixel, as shown in FIG. 10 , the amount of overlapping of pixels between the display pixels is reduced, and the resolution is improved.

  In this way, for each pixel of the image by each display element on the projection surface, the light corresponding to that pixel is collected in one place (center part, etc.) of the pixel, and when the pixel shift is performed, The overlapping portion becomes smaller and a higher resolution can be obtained.

[Fourth Embodiment]
In the present embodiment, an example in which display data of each pixel of each display element corresponding to the color component of each display element is obtained will be described.

FIG. 11 is a diagram for explaining a calculation unit according to the fourth embodiment of the present invention.

  When an image signal based on the three primary colors R ′, G ′, and B ′ of light is used as an input signal, the color component calculation processing unit 50 determines the luminance component Y and the display three primary colors R from the R ′, G ′, and B ′ components. , G, B are calculated, and the fourth display element D displays the signal of the white W (= luminance Y) component. The first to third display elements A, B, and C display R, G, and B component signals output from the color component calculation processing unit 50.

  The input three primary colors may be R, G, B defined by sRGB, HDTV, NTSC, or CIE X, Y, Z tristimulus values.

  When an image signal based on a luminance component Y and a color difference component U (or Cb or Pb) or V (or Cr or Pr) is used as an input signal, the color component calculation processing unit 50 displays three primary colors from Y, U, and V. The R, G, and B components are calculated, the fourth display element receives the white W (= luminance Y) component signal, and the first to third display elements receive the signal from the color component calculation processing unit 50. The output R, G, B component signals are displayed.

Here, from YUV, R = Y + 0.000 × U + 1.140 × V
G = Y−0.396 × U−0.581 × V
B = Y + 2.029 × U−0.000 × V
As a result, RGB components can be obtained.

  The output may not be R, G, B, and W, and the color component calculation processing unit 50 may obtain X1, X2, X3, and X4 as the four primary colors and use each color for display. .

  The result after the color component calculation processing is stored in the frame buffer 60, and the image data of each color component stored therein is projected from each display element in accordance with the number of pixels of each display element by the reduction processing calculation unit 70. Reduction filter processing centering on the pixel value of the input image signal at a position corresponding to the display position of the pixel is sent to the data shift register 80 of the display element, and displayed with the number of pixels suitable for the display element.

Further, as shown in FIG. 11 (b), the processing result of the color component processing unit 50, and input to the line buffer 90 of the plurality of rows, performs reduction processing by the reduction processing unit 70 therewith, The result may be stored in the frame buffer 60 corresponding to the pixel of each display element and sent to the data shift register of the display element for display.

  The reduction calculation processing in the reduction calculation processing unit 70 includes “nearest neighbor method (nearest neighbor method)”, “linear interpolation method (bilinear method)”, “third-order interpolation method (bicubic method)”, “ "Area average method" can be considered.

  In this way, by combining the color component calculation processing unit 50 and the reduction calculation processing unit 70, the hue / pixel data display position can be optimized.

[Fifth Embodiment]
In this embodiment, an operation for obtaining display data of pixels of each display element from an input image signal will be described.

FIG. 12 is a diagram illustrating an example of obtaining display data of pixels of each display element from an input image signal according to the fifth embodiment of the present invention.

As an input signal, the horizontal direction 8 pixels in the vertical direction 6 pixel image data is provided, on the frame buffer 60 through the color component processing unit 50 as shown in FIG. 11 (a), the as shown in FIG. 12 (a) An image of each color component is accumulated.

In the first display element A by resampling as reduction operation, lateral odd, R11 vertical odd-numbered first color component, R13, R15, R17, R 31, R33, R35, R37, R51, R53 , R55, and R57 are sent as display data to the display element.

In the second display element, the pixel data of G12, G14, G16, G18, G32, G34, G36, G38, G52, G54, G56, and G58 of the second color component of the even number in the horizontal direction and the odd number in the vertical direction are stored. It is sent as display data to the display element.

  In the third display element, the pixel data of B22, B24, B26, B28, B42, B44, B46, B48, B62, B64, B66, and B68 of the third color component of the even number in the horizontal direction and the even number in the vertical direction are stored. It is sent as display data to the display element.

  In the fourth display element, the fourth color components (white) W21, W23, W25, W27, W41, W43, W45, W47, W61, W63, W65, W67 of the odd number in the horizontal direction and the even number in the vertical direction. Pixel data can be sent to the display element as display data.

As a result the image projected on the screen is as shown in FIG. 12 (c) Looking at the pixel center position.

[Sixth Embodiment]
In the present embodiment, an example will be described in which display color components of four display elements are changed in the time direction.

FIG. 13 is a block diagram of an optical system inside the projection type image display apparatus according to the sixth embodiment of the present invention. In the figure, the same numerals are assigned to the same components as FIG.

FIG. 14 is a diagram showing a rotating color filter in the sixth embodiment of the present invention, and FIG. 15 is a combination of colors of the first to fourth rotating color filters in the sixth embodiment of the present invention. Indicates.

As shown in FIG. 13, in the configuration of inserting a rotary color filter 16, respectively in front of each display element as shown in FIG. 14 differs from the configuration of FIG. In this way, the display color of each display element is changed in the time direction by inserting the rotation color filter 16 and rotating the four rotation color filters 16 in synchronization.

  The rotation period is set to the refresh period R of the display element or 1 / integer of R.

FIG. 15 shows a state in which the display color of each display element is sequentially changed as the rotation period T. The display color of each element is the light transmitted through the circle containing the display color filters 161 and 162 above the rotation color filter 16.

  At T = 1, the first rotation color filter has the first display color, the second rotation color filter has the second display color, the third rotation color filter has the third display color, and the fourth display color. The rotation color filter displays the fourth display color.

  At the moment when T = 2, all the rotation filters are rotated 90 degrees counterclockwise, the first rotation color filter is the second display color, and the second rotation color filter is the third display color. The third rotation color filter displays the fourth display color, and the fourth rotation color filter displays the first display color.

  Similarly, at the moment when T = 3, all the rotation filters are connected 90 degrees counterclockwise, the first rotation color filter is the third display color, and the second rotation color filter is the fourth. As for the display color, the third rotation color filter displays the first display color, and the fourth rotation color filter displays the second display color.

  In this way, by combining the rotating color filter with the first to fifth embodiments described above, for example, a blue display position with a small luminance component at a certain point in time is a green display with a large luminance component over time. The change to display is realized, and the sense of resolution using the time direction is improved.

FIG. 16 shows the configuration of a projection type high-definition image display device according to the first to sixth embodiments of the present invention.

  The present invention is not limited to the above-described embodiments and examples, and various modifications and applications are possible within the scope of the claims.

  The present invention can be applied to a projector apparatus.

It is a principle block diagram of this invention. It is a figure which shows the image by the display element on the projection screen in the 1st Embodiment of this invention. It is a figure which shows the display position by the 4th display element in the 1st Embodiment of this invention. It is an optical system block diagram inside the projection type image display apparatus in the 1st Embodiment of this invention. It is a figure for demonstrating the position control mechanism in the 1st Embodiment of this invention. It is a figure which shows the display screen position in the 2nd Embodiment of this invention. It is an example of a display on the projection surface in the 2nd Embodiment of this invention. It is an example (the 1) which concentrates on the center of the pixel of each display element in the 3rd Embodiment of this invention. It is an example (the 2) which concentrates on the center of the pixel of each display element in the 3rd Embodiment of this invention. It is an example (the 3) which concentrates on the center of the pixel of each display element in the 3rd Embodiment of this invention. It is a figure for demonstrating the calculating part in the 4th Embodiment of this invention. It is a figure which shows the example which calculates | requires the display data of the pixel of each display element from the input image signal in the 5th Embodiment of this invention. It is an optical system block diagram inside the projection type image display apparatus in the 6th Embodiment of this invention. It is a figure which shows the rotation color filter in the 6th Embodiment of this invention. It is a figure which shows the combination of the color of the 1st to 4th rotation color filter in the 6th Embodiment of this invention. It is a block diagram of the projection type high-definition image display apparatus by the 1st-6th embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Positioning means 2 Screen 10 Light source 11 Lens 12 Mirror 13 Half mirror 14 PBS
15 Synthetic prism 16 Rotation color filter 50 Color component arithmetic processing unit 60 Frame buffer 70 Reduction arithmetic processing unit 80 Data shift register 90 Line buffers 161 and 162 Display color filter

Claims (5)

A projection type high-definition image display device that modulates light emitted from a light source on the front or back of a screen by four matrix type display elements A, B, C, and D, and forms an image on the screen,
A first matrix type display element A for displaying a first color component red;
A second matrix type display element B for displaying the second color component green;
A third matrix type display element C for displaying a third color component blue;
A fourth matrix type display element D that displays a luminance (white) component or a color component that includes more luminance components than the green component as a fourth color component ;
The display position from the first projected before Symbol on the screen 4 each matrix type display device, an orthogonal spatial coordinate x on the screen in units of image pitch of the projected image, with respect to y,
In order to double the number of pixels on the projection surface in the horizontal and vertical directions,
The display position of the first matrix type display device A, x-direction +1/4 · y direction +1/4,
The display position of the second matrix type display device B, x-direction -¼ · y direction +1/4,
The display position of the third matrix type display device C, x-direction +1/4 · y direction -1/4,
Adjusting the position of said fourth matrix display the display position of the device D, x-direction -1/4 · y direction -1/4, only the matrix type display device from the first to the fourth to shift obliquely A projection-type high-definition image display device. The center position of each pixel projected on the screen by arranging a microlens for each pixel of each matrix display element or by using a reflecting mirror for each pixel of each matrix display element as a concave mirror The projection-type high-definition image display device according to claim 1, wherein the projection-type high-definition image display device is focused on the screen. A color component calculation processing unit;
The color component calculation processing means includes
The first, second, and third color components and the brightness (white) that are display colors of each display element from the luminance component Y and the color difference components U · V or the three primary colors R ′, G ′, and B components of the input image signal. 3. The display data of each pixel of each display element corresponding to the fourth color component including a greater luminance component than the component) or the green component is obtained by arithmetic processing. Projection type high-definition image display device. A further reduction processing means;
The reduction calculation processing means includes:
The display data of each pixel of each display element is obtained by reduction filter processing centering on a pixel value of an input image signal at a position corresponding to a display position of each pixel projected from each display element. Item 4. The projection type high-definition image display device according to any one of Items 1 to 3.   5. The projection type high-definition image display device according to claim 1, further comprising a color component change control unit configured to change each color component of the four display elements in a time direction.

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