CN211123555U - Spatial light modulator for improving illumination uniformity of backlight three-dimensional display - Google Patents
Spatial light modulator for improving illumination uniformity of backlight three-dimensional display Download PDFInfo
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- CN211123555U CN211123555U CN201920240569.3U CN201920240569U CN211123555U CN 211123555 U CN211123555 U CN 211123555U CN 201920240569 U CN201920240569 U CN 201920240569U CN 211123555 U CN211123555 U CN 211123555U
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Abstract
A spatial light modulator for improving the illumination uniformity of a backlight three-dimensional display is applied to a backlight three-dimensional display device and is arranged between a backlight source and a lens array. According to the spatial light modulator with the specific gray scale distribution pattern, the window of the spatial light modulator has the variable transmittance and light transmission area, and the light intensity distribution of the backlight source on the space is modulated, so that the backlight illumination uniformity of the backlight three-dimensional display device can be effectively improved, and the viewing effect of backlight three-dimensional display is improved.
Description
Technical Field
The utility model relates to a three-dimensional display device is shaded, concretely relates to add and to have the spatial light modulator that can improve the illumination degree of consistency in a poor light behind the specific grey scale distribution pattern.
Background
However, most of the known backlight sources of the backlight stereoscopic display device adopt L ED light sources with small size, L ED illumination intensity distribution has nonuniform phenomenon in space, and the nonuniform illumination intensity directly causes poor backlight illumination uniformity of the system after passing through and diffusing each optical structure of the backlight stereoscopic display system.
SUMMERY OF THE UTILITY MODEL
In order to overcome the uneven problem that leads to improving the backlight illumination inhomogeneous among the current three-dimensional display device in a poor light source illumination intensity distribution, the utility model provides an improve spatial light modulator of three-dimensional display illumination degree of consistency in a poor light.
The utility model discloses state an improve spatial light modulator of three-dimensional display illumination degree of consistency in a poor light, the light beam that sends the backlight in three-dimensional display device in a poor light modulates in the space, adds at spatial light modulator and has certain grey scale distribution pattern, and its spatial light modulator window has the transmittance that changes and leads to the light area, can produce the modulation to the illumination intensity of backlight light beam, realizes the control to the illumination distribution in a poor light illumination region.
In a further implementation, the spatial light modulator window is placed behind a backlight source in a backlit stereoscopic display device, and can directly modulate and correct the known backlight illumination intensity distribution to achieve a desired uniform distribution.
In a further specific implementation, the gray scale distribution is mapped in a spatial light modulator window of a certain shape, so that the transmittance of each specific position in the spatial light modulator window is changed, the light intensity distribution of the backlight source is modulated, and the backlight illumination uniformity of the diffused light beams is improved.
In a further specific implementation, in a window of the spatial light modulator with a certain transmittance, the width of the window in the backlight diffusion direction is changed, so that the light transmission area in the window of the spatial light modulator is changed, the light intensity distribution of the backlight source is modulated, and the backlight illumination uniformity of the diffused light beams is improved.
In still further implementations, the spatial light modulator window modulates and repairs the backlight illumination non-uniformity distribution phenomenon generated by optical elements such as the backlight source, lenses, and the like.
The beneficial effects of the utility model are that, realize the control to the regional illumination distribution of being shaded, make the light intensity of the diffusion light beam of backlight reach the evenly distributed of expectation, improve the display effect of the three-dimensional display device that is shaded.
Drawings
Fig. 1 is a schematic structural diagram of a backlight stereoscopic display device to which the present invention is applied.
Fig. 2 is a schematic diagram of a spatial light modulator incorporating a gray scale profile.
Fig. 3 is a schematic diagram of a spatial light modulator with varying widths.
Description of reference numerals:
100-use the utility model discloses a three-dimensional display device in a poor light, 110-backlight array, 111-light source unit, 120-spatial light modulator array, 121-spatial light modulator window unit, 130-lens array, 131-lens unit, 140-linear diffusion barrier, 150-image display element, 160-visual region, 161-visual region unit.
200-first embodiment of spatial light modulator, 210-liquid crystal display, 220-spatial light modulator window incorporating a grey scale distribution.
300-first embodiment of spatial light modulator, 310-liquid crystal display, 320-variable width spatial light modulator window unit.
Detailed Description
The invention will be further described with reference to the following figures and examples:
example 1:
referring to fig. 1, fig. 1 is a schematic diagram of a backlit stereoscopic display device incorporating a spatial light modulator array having a particular gray scale distribution pattern. The spatial light modulator array 120 is disposed between the backlight array 110 and the lens array 130, wherein the spatial light modulator window units and the light source units are in a one-to-one correspondence relationship.
The backlight illumination light intensity distribution of the backlight three-dimensional display device can be obtained by collecting images in the center of a visual area, the spatial light modulator array 120 is required to be generated based on a liquid crystal display during collection, the window transmittance of the spatial light modulator is set to be 100%, namely, the window transmittance is in a full white state, a display area outside the window is in a full black state, and the shape of the window is a rectangle by default.
After the image of the backlight illumination surface is acquired at a fixed position, the gray value range of the image is set to [0,255 ]]And acquiring the gray value corresponding to each pixel along the direction perpendicular to the diffusion direction of the image to obtain the gray distribution in the direction. Setting the gray value distribution G corresponding to the backlight illumination light intensity distribution(i)Where i represents the pixel coordinate. The spatial light modulator window is generated by calculation according to a certain proportional relation based on the backlight illumination light intensity distribution of the original backlight three-dimensional display device and the set expected gray scale distribution. The calculated proportional relationship is determined by the modulation mode of the spatial light modulator window to the backlight, namely, the transmittance of the spatial light modulator window is adjusted or the width of the spatial light modulator window is adjusted.
Example 2:
in the example shown in fig. 2, the modulation of the backlight by the spatial light modulator window is achieved by adjusting the transmittance of the spatial light modulator window. The gray scale distribution of the spatial light modulator window is set according to the gray scale value distribution G corresponding to the backlight illumination light intensity distribution(i)Obtained is provided with GeThe gray value of the corresponding pixel point i under the expected illumination distribution of the backlight illumination surface is represented by the gray value distribution W of the corresponding j rows of pixels in the window along the direction vertical to the diffusion direction(j)Comprises the following steps:
where γ is related to the gamma value setting of the LCD 310, γ can be set to a value in relation to the gray scale value range [0,255 ] in practical applications]The piecewise function of (2). In this example, assume G(i)For normal distribution, take GeWhen the value is 200 and γ is 0.95, W can be calculated(j)。
The spatial light modulator array takes the liquid crystal display 210 as a substrate, the shape of a window of the spatial light modulator is defaulted to be rectangular, and the gray-level correction curve W is corrected(j)In a direction perpendicular to the diffusion directionMapping to each window results in a spatial modulator window 220 with a particular gray scale distribution.
Example 3:
in the example shown in fig. 3, the modulation of the backlight by the spatial light modulator window is achieved by adjusting the transmissive area of the spatial light modulator window. The setting of the light transmission area (window width) of the spatial light modulator is obtained according to the light transmission area (window width) of the original spatial light modulator window, and G is seteCorresponding gray value P of pixel point i under expected illumination distribution for backlight illumination surface0The number of pixels corresponding to the width of the default rectangular window is P, and the number of pixels in the corresponding j rows of the window in the direction perpendicular to the diffusion direction is distributed(j)Comprises the following steps:
in this example, assume G(i)For normal distribution, take Ge＝205、P0P is calculated as 20(j)Then a spatial light modulator window shape of varying width can be made.
The spatial light modulator array takes the liquid crystal display 310 as a substrate, the transmittance of a window of the spatial light modulator is 100 percent, namely the liquid crystal screen displays full white at the window of the spatial light modulator, and the calculated number P of the corresponding pixels of each line of pixels(j)Mapping onto a clear window of constant length results in a spatial light modulator window 320 of varying width.
The two spatial light modulator windows 220 and 320 have the advantages that the illumination intensity of the light beam emitted from the backlight source is spatially modulated without changing the light path structure of the backlight three-dimensional display device, so that the dark area in front of each diffused light beam on the backlight illumination surface of the backlight three-dimensional display device can be effectively eliminated, and the illumination uniformity of the backlight illumination surface is integrally improved. The utility model provides an add spatial light modulator that has specific grey scale distribution pattern has the characteristics of application scope extensively, easily operation from the principle, again because it can generate based on LCD, so have low cost, efficient characteristics.
The above examples are preferred embodiments of the present invention, but the present invention is not limited to the above examples, and any other changes, modifications, substitutions, combinations, simplifications, which do not depart from the spirit and principle of the present invention, and are intended to be equivalent substitutions, which are included in the scope of the present invention, for example, the gray scale distribution and the window width of the spatial light modulator window can be changed and used together.
Claims (5)
1. A spatial light modulator for improving illumination uniformity of a backlit stereoscopic display, in which a light beam emitted from a backlight source is spatially modulated, comprising: a certain gray scale distribution pattern is added in the spatial light modulator, and the window of the spatial light modulator has variable transmittance and light transmission area, so that the illumination intensity of a backlight source light beam can be modulated, and the control of illumination distribution of a backlight illumination area is realized.
2. The spatial light modulator of claim 1, wherein the spatial light modulator is configured to increase illumination uniformity of a backlit stereoscopic display, the spatial light modulator comprising: the spatial light modulator window is placed behind a backlight source in the backlight stereoscopic display device, and can directly modulate and correct the known backlight illumination light intensity distribution to achieve the desired uniform distribution.
3. The spatial light modulator of claim 1, wherein the spatial light modulator is configured to increase illumination uniformity of a backlit stereoscopic display, the spatial light modulator comprising: the gray level distribution is mapped in the spatial light modulator window with a certain shape, so that the transmittance of each specific position in the spatial light modulator window is changed, the light intensity distribution of the backlight source is modulated, and the backlight illumination uniformity of the diffused light beams is improved.
4. The spatial light modulator of claim 1, wherein the spatial light modulator is configured to increase illumination uniformity of a backlit stereoscopic display, the spatial light modulator comprising: in the window of the spatial light modulator with a certain transmittance, the width of the window in the backlight diffusion direction is changed, so that the light transmission area in the window of the spatial light modulator is changed, the light intensity distribution of a backlight source is modulated, and the backlight illumination uniformity of a diffused light beam is improved.
5. The spatial light modulator of claim 2, wherein the spatial light modulator is configured to increase illumination uniformity of a backlit stereoscopic display, the spatial light modulator comprising: the spatial light modulator window is used for modulating and repairing the backlight illumination uneven distribution phenomenon generated by optical elements such as a backlight source and a lens.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112347597A (en) * | 2020-11-13 | 2021-02-09 | 西安工程大学 | Method for improving LED illumination uniformity based on improved particle swarm optimization |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112347597A (en) * | 2020-11-13 | 2021-02-09 | 西安工程大学 | Method for improving LED illumination uniformity based on improved particle swarm optimization |
| CN112347597B (en) * | 2020-11-13 | 2024-04-05 | 西安工程大学 | Method for improving LED illumination uniformity based on improved particle swarm algorithm |
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Effective date of registration: 20211110 Address after: 310023 room 607, building 5, No. 1818-2, Wenyi West Road, Yuhang street, Yuhang District, Hangzhou City, Zhejiang Province Patentee after: Hangzhou Zhuxing Information Technology Co., Ltd Address before: 312030 1705, block a, Kechuang building, No. 586 West Ring Road, Keqiao Economic Development Zone, Keqiao District, Shaoxing City, Zhejiang Province Patentee before: Shaoxing Tuju Photoelectric Technology Co., Ltd |