JP2012242809A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device capable of displaying a better stereoscopic video.SOLUTION: A display device includes: a display part that includes respective plural display pixels of plural colors with different brightness from each other, has display pixels of plural colors cyclically arranged in a given sequence in a first direction, and display pixels of the same color arranged in a second direction different from the first direction, and displays plural parallax images; and a separation element that has plural parallax separation parts extending in a third direction different from both the first and second directions and separates the plural parallax images in plural viewpoint directions. Further, the following two expressions (1) and (2) are satisfied: Nx=2*Npix+Yo/(2*S)...(1); S=Nsy/Nsx...(2)

Description

  The present disclosure relates to a display device capable of performing stereoscopic display using an optical element such as a parallax barrier or a lenticular lens.

  The technique for performing stereoscopic display can be divided into those in which an observer uses glasses and those in which an observer can perform stereoscopic viewing with the naked eye without using glasses. The latter display method is called an autostereoscopic display method. Typical examples of the autostereoscopic display method include a parallax barrier method and a lenticular lens method. In the case of the parallax barrier method or the lenticular method, a plurality of stereoscopic parallax images (for example, a right eye image and a left eye image in the case of two viewpoints) are spatially divided and combined on an image display element such as a liquid crystal display. Stereoscopic viewing is performed by displaying and parallaxing the parallax image in the horizontal direction by parallax separation means (parallax element). In the case of the parallax barrier method, a parallax barrier provided with a slit-like opening is used as a parallax element. In the case of the lenticular method, a lenticular lens in which a plurality of cylindrical divided lenses are arranged in parallel is used as a parallax element. That is, the observer can recognize a stereoscopic image by visually recognizing different pixel groups in the display unit with the right eye and the left eye through a parallax barrier or a lenticular lens.

  Conventionally, the following Patent Documents 1 to 3 have been proposed as display devices employing a parallax barrier method or a lenticular method.

Japanese Patent No. 4023626 Japanese Patent No. 3955002 Japanese Patent No. 4271155

  By the way, for example, when the slit of the parallax barrier extends in the vertical direction of the screen, or when the extending direction (axial direction) of each cylindrical lens in the lenticular lens is the vertical direction of the screen, the resolution in the horizontal direction of the screen and the resolution in the vertical direction of the screen The balance of is deteriorated. This is because the resolution in the horizontal direction of the screen can be improved, but it is difficult to improve the resolution in the vertical direction of the screen. Therefore, in order to improve the resolution balance, it is conceivable to incline the extending direction of the slit and the cylindrical lens with respect to the vertical direction of the screen. However, even in such a case, the resolution balance may be insufficient. Another problem is that the boundary portion between the pixels is visually recognized by an observer as an apparent dark portion, and the appearance of the dark portion periodically appears to cause luminance unevenness (moire).

  The present disclosure has been made in view of such problems, and an object of the present disclosure is to provide a display device capable of improving resolution balance and suppressing the occurrence of moiré when performing stereoscopic display using a plurality of viewpoint videos. It is to provide.

The display device according to the present disclosure includes a plurality of display pixels of a plurality of colors, the display pixels of the plurality of colors are periodically arranged in a fixed order in the first direction, and have the same color in a second direction different from the first direction. Display pixels, a display unit that displays a plurality of parallax images, and a plurality of parallax separation units that extend in a third direction different from both the first and second directions. A separation element that separates in a plurality of viewpoint directions is provided, and both of the following expressions (1) and (2) are satisfied.
Nx = 2 × Npix + Yo / (2 × S) (1)
S = Nsy / Nsx (2)
However,
Nx: number of display pixels assigned to one parallax separation unit in the first direction Npix: odd number of 1 or more Yo: integer of 0.5 or 0 Nsx: display of the same color on a straight line extending in the third direction Number of display pixels arranged in the first direction per cycle in which the center position of the pixel appears Nsy: The second number of pixels per cycle in which the center position of the display pixel of the same color appears on a straight line extending in the third direction Number of display pixels arranged in the direction

  In the display device according to the present disclosure, Expressions (1) and (2) are satisfied in the relationship between the display pixel of the display unit and the parallax separation unit of the separation element. Thereby, in each parallax image that reaches the observer via the separation element, pixels with relatively high luminance and pixels with relatively low luminance are arranged in a balanced manner. In each parallax image, a region corresponding to the center position of the pixel and a region corresponding to the boundary portion between the pixels are arranged in a balanced manner.

  According to the display device of the present disclosure, since the inclination angle and the arrangement pitch of the plurality of parallax separation units in the separation element with respect to the pixel arrangement of the display unit are optimized, the periodic variation and directivity of the apparent brightness can be reduced. Can be relaxed. Thereby, generation | occurrence | production of a moire can be suppressed effectively, the resolution balance can be improved, and a favorable three-dimensional image can be obtained.

It is sectional drawing which shows the example of whole structure of the display apparatus as one embodiment of this indication. It is a top view showing the screen configuration of the display part shown in FIG. 1, and the positional relationship of a lenticular lens and a display part. FIG. 1 is a plan view showing a first embodiment in which the arrangement pattern of display pixels and the extending direction of a parallax separation portion (cylindrical lens) in a separation element (lenticular lens) are optimized under predetermined conditions in the display device shown in FIG. It is. It is a schematic diagram (Example 1) showing the pixel pattern which comprises the parallax image observed through a lenticular lens. It is a schematic diagram (Example 2) showing the pixel pattern which comprises the parallax image observed through a lenticular lens. FIG. 10 is a schematic diagram (Example 3) showing a pixel pattern constituting a parallax image observed through a lenticular lens. FIG. 10 is a schematic diagram (Example 4) illustrating a pixel pattern constituting a parallax image observed through a lenticular lens. It is a schematic diagram (comparative example 1) showing the pixel pattern which comprises the parallax image observed through a lenticular lens. It is a schematic diagram (comparative example 2) showing the pixel pattern which comprises the parallax image observed through a lenticular lens. FIG. 10 is a cross-sectional view illustrating an example of the overall configuration of a display device as a modification of an embodiment of the present disclosure.

  Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

[Overall configuration of display device]
FIG. 1 illustrates a configuration example of a display device as an embodiment of the present disclosure. This display device includes a lenticular lens 1 as a separation element and a display unit 2. FIG. 2 is a plan view showing the screen configuration of the display unit 2 and the positional relationship between the lenticular lens 1 and the display unit 2.

  The display unit 2 is configured by a two-dimensional display such as a liquid crystal display panel, an organic EL (electroluminescence) display panel, or a plasma display. On the display screen of the display unit 2, a plurality of pixels are two-dimensionally arranged in the horizontal direction (X-axis direction) and the vertical direction (Y-axis direction). For example, R (red) pixels, G (green) pixels, B (blue) pixels, and W (white) pixels are periodically arranged in this order in the horizontal direction. On the other hand, pixels of the same color are arranged in a row in the vertical direction. On the display unit 2, a plurality of viewpoint parallax images are assigned to each pixel in a predetermined arrangement pattern and combined and displayed.

  The lenticular lens 1 separates a plurality of parallax images included in the parallax composite image displayed on the display unit 2 in a plurality of viewpoint directions so as to enable stereoscopic viewing, and enables stereoscopic viewing. The display unit 2 is disposed opposite to the display unit 2 in a predetermined positional relationship. The lenticular lens 1 includes a plurality of divided lenses that function as parallax separation units that transmit light and that are associated with each other under predetermined conditions so that the pixels of the display unit 2 can be stereoscopically viewed. The split lens is a cylindrical lens 13 extending in a predetermined direction. In this case, as shown in FIG. 2, the cylindrical generatrix 41 of the cylindrical lens 13 extends in an oblique direction (S-axis direction).

  The lenticular lens 1 separates a plurality of parallax images included in a parallax composite image on the screen of the display unit 2 so that only a specific parallax image is visually recognized when the display unit 2 is observed from a specific viewpoint position. It is like that. From the positional relationship between the width of the lenticular lens 1 and each pixel of the display unit 2, the emission angle of light emitted from each pixel of the display unit 2 is limited. That is, the display direction of each pixel in the display unit 2 differs depending on the positional relationship with the cylindrical lens 12. Light beams L3 and L2 from different pixels arrive at the left and right eyes 10L and 10R of the observer, and can be perceived as a stereoscopic image by observing images with parallax.

[Relationship between display unit and separation element]
In the present embodiment, by optimizing the inclination angle of the cylindrical lens 13 and the arrangement pitch of the cylindrical lens 13 with respect to the pixel arrangement of the display unit 2, the periodic variation of the apparent brightness is reduced and the resolution balance is reduced. Improvements have been made.

Specifically, the display unit 2 and the lenticular lens 1 satisfy the following conditional expressions (1) and (2).
Nx = 2 × Npix + Yo / (2 × S) (1)
S = Nsy / Nsx (2)
However, Nx is the number of pixels assigned to one cylindrical lens 13 in the horizontal direction (X-axis direction), Npix is an odd number of 1 or more, Yo is an integer of 0.5 or 0, and Nsx is The number of pixels arranged in the horizontal direction per cycle in which the center position of the display pixel of the same color appears on the straight line extending in the oblique direction, and Nsy is the center position of the display pixel of the same color on the straight line extending in the oblique direction. This is the number of pixels arranged in the vertical direction (Y-axis direction) per appearing cycle.

  FIG. 3 is a schematic diagram showing a pixel row of the display unit 2 visually recognized at a specific viewpoint position when the above predetermined condition is satisfied. In FIG. 3, light from each pixel along a straight line 13L (13L1, 13L2, 13L3,...) Is condensed by one cylindrical lens 13 to form a specific parallax image. The straight line 13L is parallel to the extending direction of each cylindrical lens 13, that is, the S-axis direction.

  S in the conditional expression (2) is a parameter representing the inclination angle of the cylindrical bus 41 in each cylindrical lens 13 with respect to the pixel arrangement direction, and is defined by the number of pixels Nsx and Nsy. In the example shown in FIG. 3, for example, the mutual interval between the pixels B1 and B2 having the center on the straight line 13L1 corresponds to four pixels in the horizontal direction (that is, Nsx = 4), and in the vertical direction. This corresponds to 6 pixels (that is, Nsy = 6). Therefore, S = 1.5.

S can also be defined by the following conditional expression (3).
S · tan θ = Px / Py (3)
Here, Px is a pixel arrangement pitch in the horizontal direction, Py is a pixel arrangement pitch in the vertical direction, and θ is an inclination angle formed by the cylindrical bus 41 with respect to the pixel arrangement direction in the display unit 2.

  FIG. 4 is an example of a pixel pattern constituting a parallax image observed through the lenticular lens 1. In the pixel pattern of FIG. 4, Ph is a horizontal interval between pixels of the same color at the closest position in the T-axis direction orthogonal to the S-axis direction among the pixels whose respective center positions are visually recognized, that is, an arrangement in the horizontal direction. Pv represents a pitch, and Pv represents a vertical interval between pixels of the same color that are closest to each other in the S-axis direction among pixels whose center positions are visually recognized, that is, an arrangement pitch in the vertical direction. These arrangement pitches Ph and Pv are also shown in FIG.

Here, a condition is considered in which the widths of the two cylindrical lenses 13 are equal to the arrangement pitch Ph. The number of pixels arranged in the horizontal direction constituting one pixel group Gpix is Nunit, and the number of repetitions of the pixel group Gpix assigned to one arrangement pitch Ph is Npix. That is, the width when Npix pixel groups Gpix are arranged in the horizontal direction corresponds to the arrangement pitch Ph. Then, the following relational expression (0) is derived.
2 × Nx−Yo / S = Nunit × Npix (0)
In this embodiment, since one pixel group Gpix consists of four pixels of R, G, B, and W, Nunit = 4. Therefore, relational expression (0) is Nx = 2 × Npix + Yo / (2 × S) (1)
It becomes.

In the example of FIG. 4, the same color pixels whose center positions are visually recognized via the two adjacent cylindrical lenses 13 are located closest to each other in the T-axis direction. Therefore, Yo is an integer of 0 or more. If the same color pixels whose center positions are visually recognized via the four adjacent cylindrical lenses 13 are positioned closest to each other in the T-axis direction, Yo = 0.5. Here, when attention is paid to an arbitrary pixel G, a condition is considered in which a pixel pattern visually recognized through the cylindrical lens 13 is a pixel W adjacent to the pixel G as shown in FIG. Then, since the pixel G and the pixel W are separated by two pixels on the screen of the display unit 2, 2 × Npix = 4m + 2 = 2 × (2m + 1) (4)
Meet. In conditional expression (4), m is an integer. Therefore, Npix is an odd number.

The best condition for the balance between the resolution in the horizontal direction and the resolution in the vertical direction (resolution balance) is Pv = Ph.
Ph = Nunit × Npix × Px (5)
Pv = Py × Nsy (6)
Nunit × Npix × Px = Py × Nsy (7)
Therefore,
Npix = (Py × Nsy) / (Px × Nunit) (8)
Substituting Nunit = 4 and Py / Px = 4 into conditional expression (8),
Npix = Nsy (9)

As described above, the odd number Npix that satisfies the conditional expressions (1) and (9) is the optimum condition. Further, the maximum number of view points Nmax that can be set is obtained by replacing the parameter S with disjoint Ay and Ax (S = Ay / Ax),
Nmax = nl × (2 × Ay × Npix + Ax × Yo / 2) (10)
Here, nl represents the smallest integer in which the maximum viewpoint number Nmax is an integer.

Hereinafter, some examples in the display device of the present technology will be described.
Example 1
The pixel pattern shown in FIG. 4 corresponds to the following numerical conditions.
S = 1.5
Nsx = 4
Nsy = 6
Yo = 1

The optimum number of pixels Nx under this condition is calculated from conditional expression (1) as follows: Nx = 2 × Npix + 1/3 (11)
Here, when Npix is set to 5 close to Nsy, conditional expression (11) is Nx = 10 + 1/3 (12)
It becomes.

In FIG. 4, when the white pixel W and the green pixel G are used as the luminance centroid, the smallest dimension lattice formed by connecting the four luminance centroids located closest to each other is represented by C1. In addition, when only the white pixel W is used as the luminance centroid, the minimum size lattice formed by connecting the four luminance centroids located closest to each other is represented by C2. In the present embodiment, the grid C1 has a shape that is extremely close to a square, and is approximately 1/2 ^{0.5 of the} distance between the grid points of the grid C2. By appropriately arranging the pixel W and the pixel G and performing signal processing using the pixel W and the pixel G as separate luminance centers of gravity, the resolution balance can be improved while improving the resolution.

  Next, moire will be described. For example, the pixels B1 and B2 on the straight line 13L1 shown in FIG. 3 are pixels whose central positions are visually recognized from the same viewpoint position through the same cylindrical lens 13 as described above. These pixels B1 and B2 are separated from each other by six pixels in the vertical direction on the screen of the display unit 2. However, the center position of the pixel R1 at the intermediate position thereof (position that is three pixels away from both the pixels B1 and B2 in the vertical direction) is also on the straight line 13L1. That is, the center position of the pixel R1 is visually recognized from the same viewpoint position as the pixels B1 and B2. On the straight line 13L1, a boundary position between the pixel W1 and the pixel W2 exists at a position separated from the pixel B1 by 1.5 pixels in the vertical direction. The straight line 13L1 passes through the center position of the pixels W1 and W2 in the horizontal direction. Furthermore, a boundary position between the pixel G1 and the pixel G2 exists at a position that is 4.5 pixels away from the pixel B1 in the vertical direction on the straight line 13L1. The straight line 13L1 passes through the center position of the pixels G1 and G2 in the horizontal direction. Such a relationship is also true for pixels on the straight line 13L3 corresponding to the two adjacent cylindrical lenses 13. On the other hand, the straight line 13L2 corresponding to the adjacent cylindrical lens 13 passes through the center position of the pixel G and the pixel W, and also passes through the boundary position between the pixels R and the boundary position between the pixels R. As a result of such a configuration, in the pixel pattern shown in FIG. 4, in both the S-axis direction and the T-axis direction, a high-luminance region where the center position of the pixel can be seen and a low-luminance region where the boundary position between adjacent pixels can be seen And are arranged alternately. Therefore, the high-luminance region and the low-luminance region appear to be mixed from any angle, and moire caused by the boundary portion (non-light-emitting portion) of the pixel can be avoided. In particular, since the region where the center position of the pixel of each color can be seen is present in a regular order without unevenness, moire caused by high and low luminance due to the color difference is less likely to occur.

The settable maximum number of viewpoints Nmax is obtained by substituting the following numerical values into the conditional expression (10), and Nmax = 31.
nl = 1
Ax = 2
Ay = 3
Npix = 5
Yo = 1

By the way, if the number of viewpoints that can be set does not exceed this, it can be set. The viewpoint data given to each pixel is represented by the following conditional expression (13).
V (x, y) = mod (xy / S, Nx) Ntot / Nx (13)
Here, Ntot represents the number of set viewpoints, and mod (a, b) represents a remainder obtained by dividing a by b. V (x, y) is an integer value when Ntot = Nmax, but may be a non-integer value in other cases. In the case of a non-integer value, the two viewpoint data are mixed. For example, the data of the first and second viewpoints is mixed at a ratio of 50% to the pixel in which V (x, y) = 1.5. The mixing ratio is not limited to the case of following a linear function, but may be defined by another appropriate function.

  The number of set viewpoints and stereoscopic display characteristics will be briefly described. As the set number of viewpoints increases, the angle resolution increases and smooth viewpoint movement becomes possible. On the other hand, since the spatial resolution per viewpoint is lowered, it is difficult to express a pattern with parallax and a high spatial frequency. The smaller the number of set viewpoints, the higher the spatial resolution per viewpoint. In addition, since the crosstalk between adjacent viewpoints becomes small, a stereoscopic display with little crosstalk becomes possible by limiting to the optimum position. On the other hand, when it deviates from the optimal viewpoint, the adjacent viewpoint image becomes conspicuous as a ghost, and smooth viewpoint movement becomes difficult. It is desirable to determine the number of viewpoints in consideration of the resolution of the display device, parallax of the input multi-viewpoint image, system cost, and the like.

(Example 2)
Next, a second example (Example 2) in the present embodiment will be described with reference to FIG. FIG. 5 is a pixel pattern corresponding to the present embodiment observed through the lenticular lens 1 and satisfies the following numerical conditions.
S = 1.0
Nsx = 4
Nsy = 4
Yo = 1

The optimum number of pixels Nx under this condition is calculated from conditional expression (1) as follows: Nx = 2 × Npix + 1/2 (14)
Here, when Npix is set to 3 close to Nsy, conditional expression (14) is Nx = 6 + 1/2 (15)
It becomes.

The settable maximum number of viewpoints Nmax is obtained by substituting the following numerical values into the conditional expression (10), and Nmax = 13.
nl = 1
Ax = 1
Ay = 1
Npix = 3
Yo = 1

  In this embodiment, since the parameter S is an integer value in the column L1 visually recognized by a certain cylindrical lens 13, the center positions of pixels of all colors are visually recognized. That is, only the high luminance region in which the center position of the pixel is visible is continuous in the S-axis direction. Two pixels of the same color at the closest position in the column L1 are separated by four pixels. Such a relationship also holds for the pixels on the column L1 corresponding to the two adjacent cylindrical lenses 13. On the other hand, in the row L2 corresponding to the adjacent cylindrical lens 13, only the low luminance region in which the boundary position between adjacent pixels in the S-axis direction is visible is continuous. That is, in this pixel pattern, the column L1 consisting of only the high luminance region and the column L2 consisting of only the low luminance region are alternately arranged. Therefore, the high-luminance region and the low-luminance region appear to be mixed in any angle when viewed from any angle, and moire caused by the boundary portion (non-light-emitting portion) of the pixel can be avoided.

(Example 3)
Next, a third example (Example 3) in the present embodiment will be described with reference to FIG. FIG. 6 is a pixel pattern corresponding to the present example observed through the lenticular lens 1 and satisfies the following numerical conditions.
S = 2.0
Nsx = 4
Nsy = 8
Yo = 1

The optimum number of pixels Nx under this condition is calculated from conditional expression (1) as follows: Nx = 2 × Npix + 1/4 (16)
Here, when Npix is set to 7 close to Nsy, conditional expression (16) is Nx = 7 + 1/4 (17)
It becomes.

The maximum viewpoint number Nmax that can be set is obtained by substituting the following numerical values into the conditional expression (10), and Nmax = 57.
nl = 2
Ax = 1
Ay = 2
Npix = 7
Yo = 1

  As shown in FIG. 6, even in this embodiment, the high-luminance region and the low-luminance region appear to be mixed in a balanced manner from any angle, which is caused by the pixel boundary portion (non-light-emitting portion). To avoid moiré.

Example 4
Next, a fourth example (Example 4) in the present embodiment will be described with reference to FIG. FIG. 7 is a pixel pattern corresponding to the present embodiment observed through the lenticular lens 1 and satisfies the following numerical conditions.
S = 1.5
Nsx = 4
Nsy = 6
Yo = 1

The optimum number of pixels Nx under this condition is calculated from conditional expression (1) as follows: Nx = 2 × Npix + 1/3 (18)
Here, when Npix is 7 close to Nsy (where Npix <Nsy), conditional expression (18) is Nx = 14 + 1/3 (19)
It becomes.

The settable maximum number of viewpoints Nmax is obtained by substituting the following numerical values into conditional expression (10), and Nmax = 43.
nl = 1
Ax = 2
Ay = 3
Npix = 7
Yo = 1

  As shown in FIG. 7, even in this embodiment, the high-luminance region and the low-luminance region appear to be mixed in a balanced manner from any angle, which is caused by the boundary portion of the pixel (non-light emitting portion). To avoid moiré.

(Comparative Example 1)
Next, FIG. 8 and FIG. 9 show a pixel pattern as Comparative Example 1 for the present embodiment. 8 and 9 are observed from different viewpoint positions. The pixel patterns shown in FIGS. 8 and 9 correspond to the case where S = 1 and Nx = 13, and do not satisfy the conditional expression (1).

  In the pixel pattern of FIG. 8, pixels of the same color are connected in the T-axis direction, and C3 is a minimum size lattice formed by connecting the four luminance centroids located closest to each other. It has become. For this reason, the resolution balance is poor and moire tends to occur. In addition, in the pixel pattern of FIG. 9, since the boundary between the pixels can be seen without seeing the center position of the pixel, the overall luminance is lower than that of the pixel pattern of FIG. 9, and moire occurs. Easy to use.

[Effect of the embodiment]
As described above, in the display device according to the present embodiment, the inclination angle and the array pitch of each cylindrical lens 13 with respect to the pixel array of the display unit 2 are optimized. Thereby, the resolution balance of the three-dimensional image obtained via the lenticular lens 1 can be improved. In addition, moire is greatly improved by the above optimization. Moire is due to the fact that when viewed from the same viewpoint position, the apparent luminance does not match between the area where the center position of the pixel can be seen and the area where the boundary position between the pixels can be seen. Therefore, by optimizing the inclination angle and arrangement pitch of the cylindrical lenses 13 with respect to the pixel arrangement of the display unit 2 and mixing the apparent high luminance area and low luminance area in the pixel pattern visually recognized by the observer, moire is achieved. Can be eliminated.

  As described above, according to the display device of the present embodiment, it is possible to reduce periodic fluctuations and directivity of apparent brightness in a stereoscopic image visually recognized by an observer. Thereby, generation | occurrence | production of a moire can be suppressed effectively, the resolution balance can be improved, and a favorable three-dimensional image can be obtained.

  Although the present technology has been described with reference to some embodiments, the present technology is not limited to these embodiments and the like, and various modifications are possible. For example, in the above embodiment, the lenticular lens as the separation element and the display unit are arranged in this order from the viewer side. However, in the present technology, when a transmissive liquid crystal display is used as the display unit, the display unit and the lenticular lens may be sequentially arranged from the observer side.

  In the above embodiment, the lenticular lens is used as the separation element. However, for example, the parallax barrier 1A shown in FIG. 10 may be used instead.

  The parallax barrier 1A separates a plurality of parallax images included in the parallax composite image displayed on the display unit 2 in a plurality of viewpoint directions so as to enable stereoscopic viewing, and enables stereoscopic viewing. The display unit 2 is opposed to the display unit 2 in a predetermined positional relationship. The parallax barrier 1A includes a shielding unit 11 that shields light, and an aperture as a parallax separation unit that transmits light and is associated with pixels of the display unit 2 under a predetermined condition so as to enable stereoscopic viewing. Part 12. The parallax barrier 1A is formed, for example, by placing a black material that does not transmit light, a thin-film metal that reflects light, or the like as the shielding portion 11 on a transparent flat plate. The opening 12 of the parallax barrier 1A is provided in a step shape (step shape) in an oblique direction (S-axis direction). Alternatively, the openings 12 may be provided in an oblique stripe shape. The image display element 2 composites and displays a plurality of viewpoint parallax images in a pattern corresponding to the barrier pattern. In the case of a step-like barrier pattern, a plurality of parallax images are divided into steps in a predetermined arrangement pattern in an oblique direction according to the barrier pattern and combined. When the parallax barrier 1A is used, the extending direction and the arrangement pitch of the openings 12 may satisfy predetermined conditions similar to those of the cylindrical lens 13 of the lenticular lens 1 in the above embodiment.

  In the above embodiment, the pixel arrangement order in the display unit is R, G, B, and W. However, the present technology is not limited to this, and other arrangement orders can be adopted. However, in order to obtain a better resolution balance, it is preferable that pixels with relatively high luminance and pixels with relatively low luminance are alternately arranged in the horizontal direction as described in the above embodiment. Also, the color of the pixel is not limited to that of the above embodiment, and other colors such as R, G, B, and Y (yellow) may be used.

  In addition, the conditional expressions described in the above embodiments and the like indicate optimum conditions for achieving both an excellent resolution balance and a moire suppressing effect. Therefore, even if a slight deviation occurs due to a manufacturing error or the like, a sufficient effect can be expected as long as each conditional expression is substantially satisfied.

Moreover, this technique can take the following structures.
<1>
A plurality of display pixels having a plurality of colors with different luminances are included, the display pixels of the plurality of colors are periodically arranged in a predetermined order in the first direction, and the same color in a second direction different from the first direction. A display unit in which display pixels are arranged to display a plurality of parallax images;
A separation element that has a plurality of parallax separation units extending in a third direction different from both the first and second directions and separates the plurality of parallax images into a plurality of viewpoint directions;
A display device that satisfies the following expressions (1) and (2).
Nx = 2 ・ Npix + Yo / (2 ・ S) (1)
S = Nsy / Nsx (2)
However,
Nx: number of display pixels assigned to one parallax separation unit in the first direction Npix: odd number of 1 or more Yo: integer of 0.5 or 0 Nsx: display of the same color on a straight line extending in the third direction Number of display pixels arranged in the first direction per cycle in which the center position of the pixel appears Nsy: The second number of pixels per cycle in which the center position of the display pixel of the same color appears on a straight line extending in the third direction Number of display pixels arranged in the direction <2>
Including display pixels of first to fourth colors as the display pixels of the plurality of colors;
The display device according to <1>, wherein the number Nsx of display pixels in Formula (2) is four.
<3>
The display pixels of the first to fourth colors are periodically arranged in the first direction in that order,
The display device according to <2>, wherein the display pixels of the second and fourth colors have higher luminance than the display pixels of the first and third colors.
<4>
The display device according to <3>, wherein the first to fourth colors are red (R), green (G), blue (B), and white (W), respectively.
<5>
The separation element is a parallax barrier having a plurality of openings that transmit light and function as the plurality of parallax separation units, and a shielding unit that shields light,
The display device according to any one of <1> to <4>, wherein the shape of the opening has a step shape or an oblique stripe shape extending in the third direction.
<6>
The separation element is a lenticular lens having a plurality of divided lenses that function as the plurality of parallax separation units,
The display device according to any one of <1> to <5>, wherein the split lens is a cylindrical lens extending in a predetermined direction, and a cylindrical generatrix direction thereof coincides with the third direction. .
<7>
The display device according to any one of <1> to <6>, wherein the first direction is a horizontal direction and the second direction is a vertical direction.
<8>
The display device according to any one of <1> to <7>, in which S = 1.5 and Nx = 10 + 1/3 or Nx = 14 + 1/3.
<9>
The display device according to any one of <1> to <8>, in which S = 1 and Nx = 6 + 1/2.
<10>
The display device according to any one of <1> to <9>, in which S = 2 and Nx = 7 + 1/4.

  DESCRIPTION OF SYMBOLS 1 ... Lenticular lens, 1A ... Parallax barrier, 2 ... Display part, 10L ... Left eye, 10R ... Right eye, 11 ... Shielding part, 12 ... Opening part, 13 ... Cylindrical lens, 41 ... Cylindrical bus-line.

Claims (10)

A plurality of display pixels having a plurality of colors with different luminances are included, the display pixels of the plurality of colors are periodically arranged in a predetermined order in the first direction, and the same color in a second direction different from the first direction. A display unit in which display pixels are arranged to display a plurality of parallax images;
A separation element that has a plurality of parallax separation units extending in a third direction different from both the first and second directions and separates the plurality of parallax images into a plurality of viewpoint directions;
A display device that satisfies the following expressions (1) and (2).
Nx = 2 × Npix + Yo / (2 × S) (1)
S = Nsy / Nsx (2)
However,
Nx: number of display pixels assigned to one parallax separation unit in the first direction Npix: odd number of 1 or more Yo: integer of 0.5 or 0 Nsx: display of the same color on a straight line extending in the third direction Number of display pixels arranged in the first direction per cycle in which the center position of the pixel appears Nsy: The second number of pixels per cycle in which the center position of the display pixel of the same color appears on a straight line extending in the third direction Number of display pixels arranged in the direction Including display pixels of first to fourth colors as the display pixels of the plurality of colors;
The display device according to claim 1, wherein the number Nsx of display pixels in Formula (2) is four. The display pixels of the first to fourth colors are periodically arranged in the first direction in that order,
The display device according to claim 2, wherein the display pixels of the second and fourth colors have higher luminance than the display pixels of the first and third colors. The display device according to claim 3, wherein the first to fourth colors are red (R), green (G), blue (B), and white (W), respectively. The separation element is a parallax barrier having a plurality of openings that transmit light and function as the plurality of parallax separation units, and a shielding unit that shields light,
The display device according to claim 1, wherein a shape of the opening has a step shape or an oblique stripe shape extending in the third direction. The separation element is a lenticular lens having a plurality of divided lenses that function as the plurality of parallax separation units,
The display device according to claim 1, wherein the split lens is a cylindrical lens extending in a predetermined direction, and a cylindrical generatrix direction coincides with the third direction. The display device according to claim 1, wherein the first direction is a horizontal direction and the second direction is a vertical direction. The display device according to claim 1, wherein S = 1.5 and Nx = 10 + 1/3 or Nx = 14 + 1/3. The display device according to claim 1, wherein S = 1 and Nx = 6 + 1/2. The display device according to claim 1, wherein S = 2 and Nx = 7 + 1/4.

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