• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    White light source 12, electro-optic light modulator 16 which modulates light in accordance with the display signal, projection lens 18 and dichroic filter which separates the white light into color components before modulation and recombines the modulated color components before projection In a color projection display system with a (A, B, C, D), the color uniformity of the display is improved by specifying a filter with different cutoff wavelengths of separation and recombination for at least one of the color components.
    公开号:KR20010053629A
    申请号:KR1020017001431
    申请日:2000-05-24
    公开日:2001-06-25
    发明作者:브라드레이랄프
    申请人:요트.게.아. 롤페즈；코닌클리케 필립스 일렉트로닉스 엔.브이.；
    IPC主号:
    专利说明:

    Color projection display system with reduced hue variation
    Most color projection display systems using one or more electro-optical light modulators also have a single white illumination source, a first set of dichroic filters arranged to separate white light from the source into primary colors (red, blue and green). And a second set of dichroic filters for recombining the components after modulation.
    The design of such a system defines that the dichroic filter is tilted at an angle of typically 45 degrees into the path of the light beam. This inclined surface in the optical path differs in other respects from the symmetrical arrangement of the light rays relative to the top and bottom of the modulator panel (s) (or left and right, depending on layout) and the corresponding asymmetry of the light rays in the projected images Break
    The already known sensitivity to this asymmetry and the unique transmission of these filters to the angle of incidence of the light beams striking this surface results from changes in the cutoff wavelengths of the filters and the resulting change in the primary color tone of the display image, with the change in direction being the optical path. Depends on the direction of the dichroic filter slope.
    Co-pending US patent application S.N. filed June 19, 1998. In 09 / 100,829 (Agent Lit. No. PHA 23425), the specification is incorporated herein by reference, where a dichroic filter with reduced angle sensitivity and sharper cutoff wavelength is described. Although the use of such enhanced filters in color projection display systems reduces hue shift, a perceptible hue shift may still occur.
    The invention was made with the support of the US administration under Award 70NANB5H1070, entitled "High Information Content Display Technology", granted by the Department of Commerce through the National Institute of Science and Technology (NIST).
    The present invention relates to a color projection display system having a white light illumination source, at least one electro-optic modulator and a projection lens, the system further comprising a first set of white light to separate white light into color components. A dichroic filter, each of the first set of filters having at least one cutoff wavelength for separating at least one color component, the system also having a second set for recombining these components A dichroic filter, wherein each of the second set of dichroic filters has at least one cutoff wavelength to recombine at least one color component.
    1-6 are schematic diagrams of optical paths for six different orders of separating R, G and B color components for a color projection display system of the present invention.
    7-9 are schematic diagrams illustrating three different variations of the optical path of FIG. 1.
    10-15 are CIE chromaticity diagrams illustrating hue shifts across the display surface for different combinations of blocking relationships for different orders of separation.
    FIG. 16 is a schematic diagram of a scrolling-color projection display system using dichroic filtered in the arrangement of FIG. 1; FIG.
    It is an object of the present invention to provide a color projection display system using a dichroic filter for color separation and recombination, and the display exhibits improved hue shift. This object is achieved by a color projection display system according to the invention, characterized in that the blocking wavelength separating the at least one color component is different from the blocking wavelength recombining the color component.
    Color projection display system with a white light source, an electro-optical light modulator that modulates light in accordance with a display signal, a projection lens 18 and dichroic filters that separate the white light into color components before modulation and recombine the modulated color components before projection In the hue change of the display is improved by designating a filter having a different cutoff wavelength of separation and recombination for at least one of the color components.
    Advantageous embodiments are defined in the dependent claims.
    In a better embodiment, the color projection display system has a second dividing color component with two dichroic filters in a first set that separates white light into red (R), blue (B) and green (G) components. Two dichroic filters in the set are used and the cutoff wavelengths for separation and recombination of each color component are different. These differences may range from 5-20 nm.
    As used herein, the term "blocking wavelength" of a dichroic filter refers to a wavelength that is 50% transmitted and 50% reflected at the incidence design angle of the filter.
    Light has six different orders that can be separated before modulation in the three color systems. For each of these orders, there is a desirable relationship between the cutoff wavelengths of the separation and recombination filters.
    For the BGR specified herein, i.e., the order of separating blue, green, and red, the first set of filters (filter I) separates blue light from green and red light, and the first set of second filters (filter II) separates green light from red light, a second set of first filters (filter III) recombines green light and blue light, and a second set of second filters (filter IV) Recombine red light together; The cutoff wavelength Ic of the filter I is lower than the cutoff wavelength IIIc of the filter III, and the cutoff wavelength IIc of the filter II is larger than the cutoff wavelength IVc of the filter IV.
    For the order of separating RGB, the first set of filters (filter I) separates red light from green and blue light, and the first set of second filters (filter II) separates green light from blue light. A second set of first filters (filter III) recombine red light and green light, and a second set of second filters (filter IV) recombine blue light with green and red light; Cutoff wavelength Ic of filter I is smaller than cutoff wavelength IIIc of filter III and cutoff wavelength IIc of filter II is larger than cutoff wavelength IVc of filter IV.
    For the order of separating the BRGs, the first set of filters (filter A) separates blue light into green and red light, and the second set of filters (filter B) separates red light into green light. A second set of first filters (filter C) recombine blue light and red light and a second set of second filters (filter D) recombine blue and red light together with green light; The cutoff wavelength Ac of the filter A is smaller than the cutoff wavelength Dc of the filter D, and the cutoff wavelength Bc of the filter B is larger than the cutoff wavelength Dc of the filter D.
    For the order of separating the GRBs, the first set of filters (filter A) separates green light into blue and red light, and the second set of filters (filter B) separates red light into blue light. A second set of first filters (filter C) recombine green light and red light, and a second set of second filters (filter D) recombine green and red light together with blue light; The cutoff wavelength Ac of the filter A is smaller than the cutoff wavelength Bc of the filter B, and the cutoff wavelength Ac of the filter A is larger than the cutoff wavelength Cc of the filter C.
    For the order of separating the RBGs, the first set of filters (filter A) separates red light from green and blue light, and the first set of second filters (filter B) separates blue light from green light. A second set of first filters (filter C) recombine red and blue light, and a second set of second filters (filter D) recombine blue and red light with green light; The cutoff wavelength Bc of the filter B is smaller than the cutoff wavelength Dc of the filter D, and the cutoff wavelength Ac of the filter A is larger than the cutoff wavelength Dc of the filter D.
    For the order of separating the GBR, the first set of filters (filter A) separates the green light into blue and red light, and the first set of filters (filter B) separates the blue light into red light. A second set of first filters (filter C) recombine green light with blue light, and a second set of second filters (filter D) recombine red light with blue and green light; The cutoff wavelength Ac of the filter A is smaller than the cutoff wavelength Cc of the filter C, and the cutoff wavelength Ac of the filter A is smaller than the cutoff wavelength Bc of the filter B.
    In the first two sequences of separating RGB and BGR described above, all the filters are short wave pass (SWP) or long wave pass (LWP) filters, while the third, third, separating BRG, GRB, RBG and GBR. In the fourth, fifth and sixth orders, one of the filters is a band pass (BP) filter. In the third and fifth BP filter embodiments, filter C combines colors that are not adjacent to the color spectrum, ie red and blue. In these two embodiments, the cutoff wavelength of filter C is thresholdless and may have a value that mediates the high and low cutoff wavelengths of other filters.
    These and other aspects of the invention will be described and become apparent with reference to the embodiments described hereinafter.
    There are 24 different ways to separate white light into red, blue and green light and recombine the red, blue and green light into white light using a dichroic filter. There are six possible sequences for separation and recombination.
    BGR: blue (B) is separated from green (G) and red (R);
    Separating G from R;
    Recombination of B and G;
    Recombining R with B and G;
    RGB: separate R from G and B;
    Separating G from B;
    Recombination of R and G;
    Recombination of B with R and G;
    BRG: separate B from R and G;
    Separating R from G;
    Recombination of B and R;
    Recombination of G with B and R;
    GRB: separate G from R and B;
    Separating R from B;
    Recombination of G and R;
    Recombination of B with G and R;
    RBG: separate R from B and G;
    Separating B from G;
    Recombination of R and B;
    Recombination of G with R and B;
    GBR: separate G from B and R;
    Separating B from R;
    Recombination of G and B;
    Recombining R with G and B;
    Of these six possible sequences of separation and recombination, the first two require only short wave pass (SWP) and long wave pass (LWP) filters, while the latter four separate G into R and B or R And the use of a band pass filter to recombine G with B.
    Each of the separation and recombination steps is generally accomplished using one filter. In these four filter configurations, the filters are designated A, B, C, D in the order in which the intermediate colors meet the filters. Filter A, the first filter separates one color from the other two colors, filter D, the last filter combines one color with the other two colors, and filters B and C, the middle filters separate the two colors Or recombine the two collars. Each filter can have a subtle effect on the color uniformity of each color.
    For each of the six separable sequences described above, there are two possible ways in which white light can meet filter A and two possible ways in which the recombined white light can meet filter D, i. Separation and recombination functions of each of the filters to be transmitted or reflected may be performed respectively. This possibility produces four possible changes, which are:
    0 The first separation is by reflection and the last recombination is by transmission.
    1 The first separation is by permeation, and the last recombination is also by permeation.
    2 The first separation is by reflection, and the last recombination is also by reflection.
    3 The first separation is by transmission, and the last recombination is by reflection.
    With six possible sequences of separation and recombination, these four variants use four filter systems to separate the white light into R, G, and B light and to recombine R, G, and B into white light. Occurs as
    These four variations have little or no effect on the optimal placement of the cutoff wavelength of the filters in accordance with the techniques of the present invention.
    1-6 are schematic diagrams of the optical path for six different orders of change v0 in the separations described.
    1: BGR: LWP filter A separates B from G and R by reflecting B and transmitting G and R;
    LWP filter B separates G from R by reflecting G and transmitting R;
    SWP filter C combines B and G by penetrating B and reflecting G;
    LWP filter D combines R with B and G by reflecting B and G and transmitting R.
    Figure 2: RGB: SWP filter A separates R from G and B by reflecting R and penetrating G and B;
    SWP filter B separates G from B by reflecting G and transmitting B;
    LWP filter C combines R and G by transmitting R and reflecting G;
    SWP filter D combines B with R and G by penetrating B and reflecting R and G.
    3: BRG: LWP filter A separates B from R and G by reflecting B and transmitting R and G;
    SWP filter B separates R from G by reflecting R and transmitting G;
    The SWP filter combines B and R by reflecting R and transmitting B;
    The BP filter combines G with B and R by reflecting B and R and penetrating G.
    4: GRB: BP filter A separates G from R and B by reflecting G and transmitting R and B;
    SWP filter B separates R from B by reflecting R and passing B;
    SWP filter C combines G and R by penetrating G and reflecting R;
    SWP filter D combines B with R and G by penetrating B and reflecting R and G.
    5: RBG: SWP filter A separates R from B and G by reflecting R and penetrating G and B;
    LWP filter B separates B from G by reflecting B and transmitting G;
    LWP filter C combines R and B by transmitting R and reflecting B;
    BP filter D combines G with R and B by penetrating G and reflecting R and B.
    Figure 6: GBR: BP filter A separates G from B and R by reflecting G and penetrating R and B;
    LWP filter B separates B from R by reflecting B and transmitting R;
    LWP filter C combines G and B by transmitting G and reflecting B;
    LWP filter D combines R with G and B by penetrating R and reflecting B and G.
    7-9 are schematic diagrams illustrating changes v1-v3 for the first order of separating BGRs (change v0 is shown in FIG. 1).
    7: v1: SWP filter A separates B from G and R by penetrating B and reflecting G and R;
    LWP filter B separates G from R by reflecting G and transmitting R;
    SWP filter C combines B and G by penetrating B and reflecting G.
    LWP filter D combines R with B and G by reflecting B and G and transmitting R.
    8: v2: LWP filter A separates B from G and R by reflecting B and transmitting G and R;
    LWP filter B separates G from R by reflecting G and transmitting R;
    SWP filter C combines B and G by penetrating B and reflecting G;
    SWP filter D combines R with B and G by penetrating B and G and reflecting R.
    9: v3: SWP filter A separates B from G and R by penetrating B and reflecting G and R;
    LWP filter B separates G from R by reflecting G and transmitting R;
    SWP filter C combines B and G by penetrating B and reflecting G;
    SWP filter D combines R with B and G by penetrating B and G and reflecting R.
    Yes
    Some examples of gradual changes in hue across the display surface appear in different combinations of blocking relationships of filter sets for different ordering of separation. All examples use a first set of two dichroic filters to separate the white light into R, G, and B components and to recombine using a second set of two dichroic filters, arranged according to the change v0. will be.
    The result is based on simulating the execution of each reduced motion filter. Simulation is accomplished by tracing the ray through the light path using a commercially available ray tracing program.
    For each different combination of filter sets, the hue is calculated for each color component and white at six different points along the height direction of the display surface and plotted on a conventional CIE chromaticity diagram (circular position). EBU / D65 standard hues for three colors and white are shown for comparison (triangular position).
    Example 1-4: BGR Separation Order
    Example 1-Good Cutoff Frequency Relationship: I (500 nm) <III (510 nm); II (593 nm)> IV (577 nm); The results shown in FIG. 10 show very low hue changes for blue and red, and larger changes for green. This is desirable because the eyes are more sensitive to changes in hue in red and blue than in green.
    Example 2-Cutoff Frequency Relationship: I (50 nm) <III (510 nm); II (577 nm) <IV (593 nm); The results shown in FIG. 11 show that compared to Example 1, the hue change for green is reduced but the hue change for red is unacceptably increased.
    Example 3-Cutoff Frequency Relationship: I (510 nm)> III (500 nm); II (593 nm)> IV (577 nm); The results, shown in FIG. 12, indicate that the change in hue for blue is unacceptably heavy.
    Example 4-Cutoff Frequency Relationship: I (510 nm)> III (500 nm); II (593 nm)> IV (577 nm); The results, shown in FIG. 13, indicate that the green hue change decreases but the red and blue hue changes increase.
    Example 5-RGB Separation Order; Good blocking relationship: I (577 nm) <III (593 nm); II (510 nm)> IV (500 nm); The results, shown in FIG. 14, show very small red and blue hue changes.
    Example 6-RGB Separation Order; Good blocking relationship: A> D; B <D; The results, shown in FIG. 15, show very small red and blue hue changes.
    FIG. 16 is a schematic diagram of one embodiment of a color projection display system, which is a scroll color projection display system using a single reflective liquid crystal display and dichroic filters disposed as shown in FIG. Light source 12 first meets dichroic filter A and provides a beam of white light that separates blue light from green and red light by reflection of blue light and transmission of green and red light. The blue light is sent by the mirror M1 to the rotating prism P1 and then transmitted by the dichroic mirror C and reflected by the dichroic mirror D to the polarizing beam splitter 14, which The polarizing beam splitter reflects the beam to the reflective liquid crystal display 16. The green light is separated from the red light and sent by the filter B to the rotating prism P2. Green light is then sent by the filter C to the path of blue light and to the display 16 in the same path. The remaining red light meets the rotating prism P3 and is then sent by the mirror M2 in the path of the blue and green beams. The rotating prism is synchronized with the rotation of the prism to provide sequential scrolling of the blue, green and red bands across the display 16. The display 16 modulates the light and reverses the polarization direction to produce a color display image such that the image forming light beam is sent by the polarizing beam splitter 16 to the projection lens 18.
    The present invention is described in terms of a limited number of embodiments. Other embodiments, modifications to the embodiments and technically recognized equivalents will be apparent to those skilled in the art and are considered to be within the scope of the invention, as set forth in the appended claims. For example, means other than a rotating prism can be used to sequentially scroll the color across an electro-optic display such as a rotating color wheel, a rotating color drum or an electronic color shutter.
    权利要求:
    Claims (11)
    [1" claim-type="Currently amended] In a color projection display system,
    A backlight illumination source 12, at least one electro-optical light modulator 16 and a projection lens 18, the system comprising a first set of dichroic filters A for separating the white light into color components. And B), wherein each of said first set of filters (A, B) has at least one blocking wavelength for separating at least one color component, and said system has a second to recombine these components It also includes a set of dichroic filters (C, D), each of the second set of dichroic filters (C, D) having at least one cutoff wavelength for recombining at least one color component. And the blocking wavelength separating the at least one color component is different from the blocking wavelength recombining the color component.
    [2" claim-type="Currently amended] 2. Color projection display system according to claim 1, wherein there are two dichroic filters (A, B) in the first set and two dichroic filters (C, D) in the second set. .
    [3" claim-type="Currently amended] The color projection display system of claim 2 wherein the blocking wavelengths for separating and recombining each color component are different.
    [4" claim-type="Currently amended] 4. The filter of claim 3, wherein the first set of two filters (A, B) separates white light into three color components, and the second set of two filters (C, D) comprises three colors. A color projection display system that recombines components to produce white light.
    [5" claim-type="Currently amended] 5. The method of claim 4, wherein (a) the white light is separated into red (R), green (G) and blue (B) color components by a separation order of RGB or BGR;
    (b) said first set of filters (filter I) separates blue light from green light, said second set of second filters (filter II) separates green light from red light, and said second A first set of filters (filter III) recombines green and blue light, and a second set of second filters (filter IV) recombines red and green light;
    (c) Cutoff wavelength Ic of filter I is smaller than cutoff wavelength IIIc of filter III and cutoff wavelength IIc of filter II is larger than cutoff wavelength IVc of filter IV.
    [6" claim-type="Currently amended] 5. The method of claim 4, wherein (a) the white light is separated from the red (R), green (G) and blue (B) color components by the separation order of BRG;
    (b) the first set of filters (filter A) separates blue light from green and red light, the first set of second filters (filter B) separates red light from green light, and A second set of first filters (filter C) recombine blue light and red light, and the second set of second filters (filter D) recombine blue and red light together with green light;
    (c) Cutoff wavelength Ac of filter A is smaller than cutoff wavelength Dc of filter D and cutoff wavelength Bc of filter B is larger than cutoff wavelength Dc of filter D.
    [7" claim-type="Currently amended] The method according to claim 4, wherein (a) the white light is separated into red (R), green (G) and blue (B) color components by the separation order of GRB,
    (b) the first set of filters (filter A) separates green light from blue and red light, the first set of second filters (filter B) separates red light from blue light, and A second set of first filters (filter C) recombine green and red light and the second set of filters (filter D) recombine green and red light with blue light;
    (c) Cutoff wavelength Ac of filter A is smaller than cutoff wavelength Bc of filter B and cutoff wavelength Ac of filter A is larger than cutoff wavelength Cc of filter C.
    [8" claim-type="Currently amended] The method of claim 4, wherein (a) the white light is separated into red (R), green (G) and blue (B) color components according to the separation order of RBG,
    (b) the first set of filters (filter A) separates red light from green and blue light, the first set of second filters (filter B) separates blue light from green light, and A second set of first filters (filter C) recombine red and blue light, and the second set of second filters (filter D) recombine blue and red light with green light;
    (c) Cutoff wavelength Bc of filter B is smaller than cutoff wavelength Dc of filter D and cutoff wavelength Ac of filter A is larger than cutoff wavelength Dc of filter D.
    [9" claim-type="Currently amended] The method of claim 4, wherein (a) the white light is separated into red (R), green (G) and blue (B) color components according to the separation order of GBR,
    (b) the first set of filters (filter A) separates green light from blue and red light, the first set of second filters (filter B) separates blue light from red light, and A second set of first filters (filter C) recombine green light with blue light, the second set of second filters (filter D) recombine red light with blue and green light,
    (c) Cutoff wavelength Ac of filter A is smaller than cutoff wavelength Cc of filter C and cutoff wavelength Ac of filter A is smaller than cutoff wavelength Bc of filter B.
    [10" claim-type="Currently amended] 10. The color projection display system of any one of claims 5-9, wherein the difference in the cutoff wavelengths is in the range of about 5-20 nm.
    [11" claim-type="Currently amended] An electro-optic light modulator 16 is a reflective liquid crystal display, and means P 1 , P 2 , P 3 are provided to sequentially scroll blue, green and red color bands across the display. Color projection display system.
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    同族专利:
    公开号 | 公开日
    US6191893B1|2001-02-20|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1999-06-04|Priority to US09/326,511
    1999-06-04|Priority to US09/326,511
    2000-05-24|Application filed by 요트.게.아. 롤페즈, 코닌클리케 필립스 일렉트로닉스 엔.브이.
    2000-05-24|Priority to PCT/EP2000/004886
    2001-06-25|Publication of KR20010053629A
    优先权:
    申请号 | 申请日 | 专利标题
    US09/326,511|US6191893B1|1999-06-04|1999-06-04|Color projection display system with improved hue variation|
    US09/326,511|1999-06-04|
    PCT/EP2000/004886|WO2000076223A1|1999-06-04|2000-05-24|Color projection display system with reduced hue variation|
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