CN100489595C - Stereo display device without moire patterns - Google Patents

Abstract

The invention discloses a three-dimensional display device, including a display and an optical grating arranged in front of the display. The width of Mohr ripple produced between the optical grating and the display is too tiny for human to distinguish through setting up the included angle in pixel array direction between the optical grating and the display so as to eliminate and reduce the Mohr ripple produced between the optical grating and the display. The technical proposal of the invention is adopted to achieve the three-dimensional display device, thus greatly decreasing and even eliminating Mohr ripple without any additional expense and significantly improving the three-dimensional display quality.

Description

The 3 d display device of moire-free

Technical field

The present invention relates to the stereo display field, relate in particular to a kind of 3 d display device of eliminating moir.

Background technology

Display in the market all is shown as the master with the plane.Along with the progress and the development of science and technology, three-dimensional stereo display technique should be accumulate and be given birth to.The application of three-dimensional stereo display technique makes people see three-dimensional picture and need not wear anaglyph spectacles by the three-dimensional monitor bore hole.Existing bore hole three-dimensional monitor is mainly developed based on binocular parallax, mainly is raster pattern 3D three-dimensional display; It (comprises common LCD LCD by 2D two-way array display, plasma display PDP, Field Emission Display FED, display of organic electroluminescence OLED etc.) installing grating additional on forms, grating can be divided into cylindrical grating and slit grating, cylindrical grating is called cylindrical lens raster or post mirror lens again, slit grating is called again looks barrier baffle plate or slit baffle plate, but because pixel is the matrix structure of arranging in order in the display, its light field of sending also can have matrix structure, the grating of such light field and display front interacts will form moir (as shown in Figure 1, mark 1 expression grating, mark 2 representing matrix displays, mark 3 expressions are by grating 1 and the matrix display 2 common moir that produce), obviously, the generation of moir has very big influence to the effect of 3 D stereo picture, can destroy the sight of image, have a strong impact on visual effect.

The method of eliminating moir is also arranged in the prior art, referring to Fig. 2, after the light that backlight 4 sends throws light on to the image layer 5 of matrix display, image layer 5 is illuminated and become secondary light source, because image layer 5 is matrix structures, its light field of sending also can have matrix structure, the grating of it and front interacts and forms moir, by between image layer 5 and slit grating 7, arranging a diffuser screen 6, the optical grating construction light field that diffuser screen 6 will make matrix structure light field that image layer 5 produces and slit grating 7 reflect to form all is interfered and destroys, thereby moir is disappeared.But owing to the introducing of diffuser screen 6, will reduce the transmissivity of image in this scheme, and because the diffuser screen scattering, image also can produce some distortions; Therefore the scheme of such elimination moir is unsatisfactory.

Summary of the invention

The object of the present invention is to provide a kind of 3 d display device of moire-free, the 3 D stereo picture displayed can be reached does not have the moir effect, and does not need to consume extra material, greatly saves production cost.

To achieve the object of the present invention, a kind of 3 d display device is provided, comprise display screen and the grating that is placed on this display screen the place ahead, grating is to place from the horizontal by the θ angle, wherein with the orientation position level direction of sub-pixel, described θ belongs within the common factor of the disaggregation that is obtained respectively by following three steps calculating:

The first step is calculated:

${\mathrm{\θ}}_n>\arccos \frac{P^2(n^2{A}^2+B^2)-A^2{B}^2}{2\mathrm{nAB}{P}^2}$

Wherein P is the width of the minimum moir that can see of human eye; A is the width of pixel; B is the pitch of grating, and n is a positive integer; With n=1,2,3...100, in generation, calculated θ to formula one by one ₁, θ ₂, θ ₃... .. θ ₁₀₀Ask their common factor then, obtain the scope of θ;

Second step calculated:

Wherein P is the width of the minimum moir that can see of human eye; A is the width of pixel; B is the pitch of grating, and n is a positive integer; With n=1,2,3...100, in generation, calculated θ to formula one by one ₁, θ ₂, θ ₃... .. θ ₁₀₀Ask their common factor then, obtain the scope of θ;

The 3rd step calculated:

Wherein P is the width of the minimum moir that can see of human eye; A is the width of pixel; B is the pitch of grating, and n is a positive integer; With n=1,2,3...100, in generation, calculated θ to formula one by one ₁, θ ₂, θ ₃... .. θ ₁₀₀Ask their common factor then, obtain the scope of θ.

Technique scheme of the present invention has solved the problem of the moir that occurs in the grating stereo display device.Make the 3 D stereo picture displayed have sight more, obtain better visual effect.

Description of drawings

Fig. 1 is the generation schematic diagram of moir;

Fig. 2 is a structural drawing of eliminating moir in the prior art;

Fig. 3 is the design sketch that two overlap of grating produce;

Fig. 4 is the moir analysis chart behind first kind of local amplification of the present invention;

Fig. 5 is the moir analysis chart behind second kind of local amplification of the present invention.

Embodiment

Eliminating moir among the present invention is to realize with the angle of displayer pixel row step direction by setting grating indentation direction (hereinafter to be referred as grating orientation).Through experiment repeatedly, find that the variable angle of grating orientation and displayer pixel row step direction can influence the width of the moir of generation.Like this, the angle of grating orientation and displayer pixel direction utilizes two kinds of such ways just can realize alleviating or eliminating moir making the width of moir very little so that human eye can't be differentiated once predetermined angle.

With two overlap of grating, as shown in Figure 3.A series of as we can see from the figure point of crossing.Link to each other one by one by these points, no matter horizontal, the vertical or oblique striped that all can form different directions, these clocklike striped all can cause moir.Angled overlapping the time when two gratings, dot matrix has a variety of methods of attachment.Distance between any two tie points also has nothing in common with each other, and couples together between the shortest point of distance and just forms apparent in view moir, and the long more point of distance couples together and just forms unconspicuous more moir.

Calculate the parameter of the moir that produces under the various situations below.With reference to figure 4, two overlapping gratings are arranged among the figure, this figure is the grating partial view, the two grating angles of the crossing are θ, the pitch of one of them grating is a (width that is equivalent to shading line between the display screen matrix), and the pitch of another grating is b, because the restriction of accompanying drawing size, six point of crossing of two gratings are shown in the drawings, are respectively point of fixity, point-1, point 0, point 1, point 1.1 and put 2; To the extended line of point 2, also have unshowned point of crossing at point 0, be followed successively by 3,4,5,6,7,8,9,10,11,12; To the extended line of point-1, also have unshowned point of crossing at point 0, be followed successively by-2 ,-3 ,-4 ,-5 ,-6 ,-7 ,-8 ,-9 ,-10.Mid point of the present invention-10... point-1, point 0, point 1, point 1.1, some 2... point 12 etc. only are the mark title, and numerical value is without any meaning.

At first calculate the parameter of first kind of moir: be connected and fixed a little and put 0 also two-way prolongation, tie point 1.1 and point 1 and two-way prolongation, the extended line of point of fixity and point 0 is parallel to each other with the extended line of point 1.1 with point 1, connect all point of crossing on two gratings simultaneously, every line is all parallel with above-mentioned two parallel lines, all parallel lines constitute a kind of moir, and the width of moir (i.e. distance between the two adjacent parallel lines) is: $W\left(0\right)=\frac{\mathrm{ab}}{\sqrt{a^2+b^2-2\mathrm{ab}\×\cos \mathrm{\θ}}};$ The process of shifting onto that formula is concrete does not just elaborate here.

Calculate the parameter of second kind of moir below: the structure of second kind of moir is referring to Fig. 5, be connected and fixed a little and point-1 and two-way prolongation, tie point 1.1 and point 0 and two-way prolongation, the extended line of point of fixity and point-1 is parallel to each other with the extended line of point 1.1 with point 0, connect all point of crossing on two gratings simultaneously, every line is all parallel with above-mentioned two parallel lines, and all parallel lines constitute second kind of moir, and the width of moir is: $W(-1)=\frac{\mathrm{ab}}{\sqrt{{4a}^2+b^2-4\mathrm{ab}\×\cos \mathrm{\θ}}};$

With above-mentioned dual mode roughly the same, the width of various moir can be calculated one by one, respectively as follows:

The width that is parallel to the moir that point of fixity and point 1 line produce is: W (1)=a; The width that is parallel to the moir that point of fixity and point 1.1 line produce is:

W(1.1)＝b；

The width that is parallel to the moir that point of fixity and point 2 line produce is: $W\left(2\right)=\frac{\mathrm{ab}}{\sqrt{a^2+b^2+2\mathrm{ab}\×\cos \mathrm{\θ}}};$

The width that is parallel to the moir that point of fixity and point 3 line produce is:

$W\left(3\right)=\frac{\mathrm{ab}}{\sqrt{{4a}^2+b^2+4\mathrm{ab}\×\cos \mathrm{\θ}}};$

The width that is parallel to the moir that point of fixity and point 4 line produce is:

$W\left(4\right)=\frac{\mathrm{ab}}{\sqrt{{9a}^2+b^2+6\mathrm{ab}\×\cos \mathrm{\θ}}};$

The width that is parallel to the moir that point of fixity and point 5 line produce is:

$W\left(5\right)=\frac{\mathrm{ab}}{\sqrt{{16a}^2+b^2+8\mathrm{ab}\×\cos \mathrm{\θ}}};$

The width that is parallel to the moir that point of fixity and point 6 line produce is:

$W\left(6\right)=\frac{\mathrm{ab}}{\sqrt{{25a}^2+b^2+10\mathrm{ab}\×\cos \mathrm{\θ}}};$

The width that is parallel to the moir that point of fixity and point 7 line produce is:

$W\left(7\right)=\frac{\mathrm{ab}}{\sqrt{{36a}^2+b^2+12\mathrm{ab}\×\cos \mathrm{\θ}}};$

The width that is parallel to the moir that point of fixity and point 8 line produce is:

$W\left(8\right)=\frac{\mathrm{ab}}{\sqrt{{49a}^2+b^2+14\mathrm{ab}\×\cos \mathrm{\θ}}};$

The width that is parallel to the moir that point of fixity and point 9 line produce is:

$W\left(9\right)=\frac{\mathrm{ab}}{\sqrt{{64a}^2+b^2+16\mathrm{ab}\×\cos \mathrm{\θ}}};$

The width that is parallel to the moir that point of fixity and point 10 line produce is:

$W\left(10\right)=\frac{\mathrm{ab}}{\sqrt{{81a}^2+b^2+18\mathrm{ab}\×\cos \mathrm{\θ}}};$

The width that is parallel to the moir that point of fixity and point 11 line produce is:

$W\left(11\right)=\frac{\mathrm{ab}}{\sqrt{{100a}^2+b^2+20\mathrm{ab}\×\cos \mathrm{\θ}}};$

The width that is parallel to the moir that point of fixity and point 12 line produce is:

$W\left(12\right)=\frac{\mathrm{ab}}{\sqrt{{121a}^2+b^2+22\mathrm{ab}\×\cos \mathrm{\θ}}};$

The width that is parallel to the moir that the line of point of fixity and point-2 produces is:

$W(-2)=\frac{\mathrm{ab}}{\sqrt{{9a}^2+b^2-6\mathrm{ab}\×\cos \mathrm{\θ}}};$

The width that is parallel to the moir that the line of point of fixity and point-3 produces is:

$W(-3)=\frac{\mathrm{ab}}{\sqrt{{16a}^2+b^2-8\mathrm{ab}\×\cos \mathrm{\θ}}};$

The width that is parallel to the moir that the line of point of fixity and point-4 produces is:

$W(-4)=\frac{\mathrm{ab}}{\sqrt{{25a}^2+b^2-10\mathrm{ab}\×\cos \mathrm{\θ}}};$

The width that is parallel to the moir that the line of point of fixity and point-5 produces is:

$W(-5)=\frac{\mathrm{ab}}{\sqrt{{36a}^2+b^2-12\mathrm{ab}\×\cos \mathrm{\θ}}};$

The width that is parallel to the moir that the line of point of fixity and point-6 produces is:

$W(-6)=\frac{\mathrm{ab}}{\sqrt{{49a}^2+b^2-14\mathrm{ab}\×\cos \mathrm{\θ}}};$

The width that is parallel to the moir that the line of point of fixity and point-7 produces is:

$W(-7)=\frac{\mathrm{ab}}{\sqrt{{64a}^2+b^2-16\mathrm{ab}\×\cos \mathrm{\θ}}};$

The width that is parallel to the moir that the line of point of fixity and point-8 produces is:

$W(-8)=\frac{\mathrm{ab}}{\sqrt{{81a}^2+b^2-18\mathrm{ab}\×\cos \mathrm{\θ}}};$

The width that is parallel to the moir that the line of point of fixity and point-9 produces is:

$W(-9)=\frac{\mathrm{ab}}{\sqrt{{100a}^2+b^2-20\mathrm{ab}\×\cos \mathrm{\θ}}};$

The width that is parallel to the moir that the line of point of fixity and point-10 produces is:

$W(-10)=\frac{\mathrm{ab}}{\sqrt{{121a}^2+b^2-22\mathrm{ab}\×\cos \mathrm{\θ}}};$

By that analogy, can obtain the width computing formula of all moir, just list no longer one by one here.Width for moir is: the situation of W (1)=a and W (1.1)=b, because a and b are very little, usually less than one millimeter, human eye can not be differentiated, and just need not consider here.

Therefore just no longer consider the moir situation under the both of these case, we are combined into a general formula with the moir computing formula under other situation: $W=\frac{\mathrm{ab}}{\sqrt{{\left(\mathrm{na}\right)}^2+b^2\±2\mathrm{nab}*\cos \mathrm{\θ}}},$ N is a positive integer, and θ is the angle between two gratings.The width of supposing the minimum moir that human eye can be seen is P, can release according to above-mentioned general formula, when a, b one regularly, human eye be can't see moir, θ should scope be:

$\mathrm{\&theta;}>\arccos \frac{P^2(n^2{a}^2+b^2)-a^2{b}^2}{2\mathrm{nab}{P}^2}$ Or $\mathrm{\&theta;}<\arccos \frac{a^2{b}^2-(n^2{a}^2+b^2)P^2}{2\mathrm{nab}{P}^2};$

In the above formula, a ²b ²-(n ²a ²+ b ²) P ²=a ²b ²-n ²a ²P ²-b ²P ²=b ²(a ²-P ²)-n ²a ²P ²

Wherein, a is obviously less than P, so b ²(a ²-P ²)＜0, b ²(a ²-P ²)-n ²a ²P ²＜0, i.e. a ²b ²-(n ²a ²+ b ²) P ²＜0

Therefore, $\arccos \frac{a^2{b}^2-(n^2{a}^2+b^2)P^2}{2\mathrm{nab}{P}^2}$ Must 90 ° less than 180 °, so θ is as long as＜90 ° are all satisfied this inequality.Because the angle that only needs to consider shading line between grating and the pixel is 0 °-90 °, therefore, only need to consider $\mathrm{\&theta;}>\arccos \frac{P^2(n^2{a}^2+b^2)-a^2{b}^2}{2\mathrm{nab}{P}^2}$ Scope.

Because display screen matrix can have apparent in view shading line (thereby forming grating) on three directions, that is: horizontal direction, vertical direction and vergence direction (become the direction of 71.56 degree with level, form by sub-pixel diagonal angle connecting line, the node that also is shading line between the pixel is connected to form), these black shading lines can form regular arrangement, the grating of itself and the display front formation moir that interacts.Among the present invention in order to consider the influence of the grating pair moir that the shading line constitutes between the pixel in the display screen comprehensively, also be divided into three kinds of situations accordingly and analyze, the common factor of the scope of each θ that obtain of three kinds of situations is will be eliminated or the angle of grating and horizontal direction should be provided with when reducing moir scope.Below be respectively three kinds under the situation the moir computing formula and the computing formula of θ, because in three kinds of situations, the raster width that the shading line forms between the pixel in the display screen is different, for the unification of parameter in the formula and the correctness of formula, here set the width that A is a pixel, B is the pitch of grating, θ is the angle (θ is between 0 °-90 °) of grating and horizontal direction, n is a positive integer, the present invention sets the narrow limit horizontal direction parallel of sub-pixel, broadside is parallel with vertical direction, it will be appreciated by those skilled in the art that, if the arrangement of display picture element changes, horizontal direction and vertical direction are also corresponding to change.Corresponding concrete formula is as follows: one, the shading line forms the general formula of moir width and the computing formula of θ between the pixel of grating and horizontal direction: $W_n=\frac{\mathrm{AB}}{\sqrt{{\left(\mathrm{nA}\right)}^2+B^2\&PlusMinus;2\mathrm{nAB}*\cos \mathrm{\&theta;}}};$ Obtain θ _nFor:

${\mathrm{\&theta;}}_n>\arccos \frac{P^2(n^2{A}^2+B^2)-A^2{B}^2}{2\mathrm{nAB}{P}^2}$ Wherein P is for supposing the width of the minimum moir that human eye can be seen; N is a positive integer, and A is the width of pixel; B is the pitch of grating; The scope of θ is exactly in fact all θ _nCommon factor, n can get 1-100 or bigger, get usually 50 just enough because the n value that influences the θ maximum is usually near B/A.

Two, the general formula of the width formula of shading line formation moir and the computing formula of θ between the pixel of grating and vertical direction:

Obtain θ _nFor:

The qualification of computing method and parameter is identical with above-mentioned first kind of situation.

Three, the general formula of the width formula of shading line formation moir and the computing formula of θ between the pixel of grating and vergence direction:

Obtain θ _nFor:

Can be divided into following two inequality:

Or

The qualification of computing method and parameter is identical with above-mentioned first kind of situation.

Enumerating several examples below describes: first example: parameters of display is as follows: unit: mm; 46 cun displays: pixel wide size A=0.53025, size of display 1920 * 1080; Display is long: 1920*0.53025=1018.08; Display is wide: 1080*0.53025=572.67; The grating pitch that adopts in this example is B=1.50305, and we suppose P=3mm.

First kind of situation: the moir that grating becomes with the pixel black line of horizontal direction: with the value substitution inequality of A, B and P: ${\mathrm{\&theta;}}_n>\arccos \frac{P^2(n^2{A}^2+B^2)-A^2{B}^2}{2\mathrm{nAB}{P}^2},$ With n=1,2,3...100, in generation, calculated θ to formula one by one ₁, θ ₂, θ ₃... .. θ ₁₀₀Ask their common factor then, the result is: θ〉9.3 °.

Because θ is the angle between two gratings, therefore, θ is the angle of grating and horizontal direction here; Here n value from 1 to 100 special case just can be got manyly, can certainly get less, and experiment shows repeatedly, and near the common value at b/a of the n value that has the greatest impact of moir, so the span of n also can be according to circumstances and fixed.Owing to adopt COMPUTER CALCULATION now, so even the n value gets 10,000 even more, also be easy to calculate the result, because the result of b/a can not surpass 20 usually, n gets usually more than 50 and just can meet the demands.Second kind of situation: the moir that the shading line forms between grating and the vertical pixel: with the value substitution formula of A, B and P:

With n=1,2,3...100, in generation, calculated θ to formula one by one ₁, θ ₂, θ ₃... .. θ ₁₀₀Ask their common factor then, the result is: θ＜89.5 °.

The third situation: the moir that the shading line forms between grating and the oblique pixel: with the value substitution formula of A, B and P:

With n=1,2,3...100, in generation, calculated θ to formula one by one ₁, θ ₂, θ ₃... .. θ ₁₀₀Ask their common factor then, the result is: θ〉74.8 °.Value substitution formula with A, B and P:

With n=1,2,3...100, in generation, calculated θ to this formula one by one ₁, θ ₂, θ ₃... .. θ ₁₀₀Ask their common factor then, the result is: θ＜68.4 °; The θ as a result that will under three kinds of situations, obtain respectively〉9.3 °, θ＜89.5 °, θ〉74.8 ° and θ＜68.4 ° seek common ground, and obtain 9.3 °＜θ＜68.4 ° or 74.8 °＜θ＜89.5 °; Through experimental verification, experimental result conforms to substantially with the theoretical result who obtains.

3 d display device according to technical scheme of the present invention realizes does not need extra cost just can reach the effect that reduces greatly even eliminate moir, has greatly improved the stereo display quality.

Above-mentioned embodiment only is schematic; rather than restrictive, those skilled in the art is not breaking away under the scope situation that this method aim and claim protect under the enlightenment of this method; can also make a lot of distortion, these all belong within protection scope of the present invention.

Claims (2)

1, a kind of 3 d display device, comprise display screen and the grating that is placed on this display screen the place ahead, it is characterized in that, grating is to place from the horizontal by the θ angle, wherein with the orientation position level direction of sub-pixel, described θ belongs within the common factor of the disaggregation that is obtained respectively by following three steps calculating:

The first step is calculated:

${\mathrm{\&theta;}}_n>\arccos \frac{P^2(n^2{A}^2+B^2)-A^2{B}^2}{2\mathrm{nAB}{P}^2}$

Wherein P is the width of the minimum moir that can see of human eye; A is the width of pixel; B is the pitch of grating, and n is a positive integer; With n=1,2,3...100, in generation, calculated θ to formula one by one ₁, θ ₂, θ ₃... .. θ ₁₀₀Ask their common factor then, obtain the scope of θ;

Second step calculated:

Wherein P is the width of the minimum moir that can see of human eye; A is the width of pixel; B is the pitch of grating, and n is a positive integer; With n=1,2,3...100, in generation, calculated θ to formula one by one ₁, θ ₂, θ ₃... .. θ ₁₀₀Ask their common factor then, obtain the scope of θ;

The 3rd step calculated:

Wherein P is the width of the minimum moir that can see of human eye; A is the width of pixel; B is the pitch of grating, and n is a positive integer; With n=1,2,3...100, in generation, calculated θ to formula one by one ₁, θ ₂, θ ₃... .. θ ₁₀₀Ask their common factor then, obtain the scope of θ.

2, a kind of 3 d display device according to claim 1, A=0.53025mm wherein, B=1.50305mm, P=3mm, 9.3 °＜θ＜68.4 ° or 74.8 °＜θ＜89.5 °.

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