JP2017062395A - Video display device, video display system and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image display device capable of allowing a large amount of light to enter the pupil of an observer and suppressing the occurrence of display unevenness when the viewing distance changes. A video display device (10) includes a display unit (14), a barrier (21), a lenticular lens (22) arranged on the surface of the barrier (21), a pupil diameter determination unit (164), a distance determination unit (163), and a barrier display position determination unit. 167 and a barrier control unit 168. The pupil diameter determination unit 164 determines the pupil diameter of the viewer of the display unit 14, and the distance determination unit 163 determines the viewing distance. The barrier display position determination unit 167 suppresses the occurrence of display unevenness at the visual distance based on the thickness and refractive index of the lenticular lens 22, the pupil diameter, the pixel pitch of the display unit 14, the width of the light transmission region 23, and the visual distance. Then, the arrangement interval of the light transmission regions 23 estimated to be determined is determined. The barrier control unit 168 controls the barrier so that the light transmission regions 23 are arranged at the determined arrangement intervals. [Selection diagram] Fig. 4

Description

  The present invention relates to a video display device, a video display system, and a method thereof.

  An image display device that controls a suitable viewing distance of a stereoscopic image by arranging a light shielding barrier between a liquid crystal panel and a light source and controlling the light shielding barrier is known (for example, see Patent Documents 1 to 3). ). Also, video display devices that control the shape and position of the light shielding barrier are known (see, for example, Patent Documents 4 to 6).

  In addition, by detecting the gaze direction and suppressing the distortion of the image caused by eye movement within an allowable range, the distortion of the retinal image due to the Stiles-Crawford effect is compensated when suppressing the distortion of the retinal image. A video display device is known (see, for example, Patent Document 7).

  Further, there is known an image display device that allows a presbyopic person to see a focused display without putting on reading glasses by causing light emitted from the pixels to enter the pupil of the observer through a microlens. (For example, see Patent Document 8). In this image display device, the light emitted from one point of the pixel is made into a light beam having a diameter smaller than the pupil diameter of the observer through a microlens, thereby increasing the depth of field and achieving a focused display. Is provided.

Japanese Patent Application Laid-Open No. 10-1223459 JP 2005-92103 A JP 2011-53277 A Japanese Patent Laid-Open No. 3-119889 JP-A-7-270745 JP 2001-166259 A JP-A-7-64013 JP 2011-100090 A

  However, when the light emitted from the pixel is incident on the observer's pupil via the microlens, only the light emitted from one point of the pixel is projected on the observer's pupil via the microlens. There is a problem that the amount of light to be emitted is small.

  In one embodiment, an object of the present invention is to provide a video display device that can allow a large amount of light to enter the pupil of an observer and suppress display unevenness when the viewing distance changes.

  In one aspect, the video display device includes a display unit, a barrier, a lenticular lens, a pupil diameter determination unit, a distance determination unit, a barrier display position determination unit, and a barrier control unit. The barrier is arranged so that one surface faces the surface of the display unit, and a plurality of light transmission regions that transmit light displayed by the display unit to the other surface opposite to the one surface, and light that does not transmit light The opaque regions can be alternately arranged at a desired arrangement interval. The lenticular lens is disposed on the other surface of the barrier, and emits light that has passed through the plurality of transmission regions so as to be collected. The pupil diameter determining unit determines the pupil diameter of an observer who visually recognizes the display unit. The distance determining unit determines a visual distance between the center of curvature of the lenticular lens and the pupil of the observer. The barrier display position determination unit is arranged based on the thickness and refractive index of the lenticular lens, the pupil diameter, and the viewing distance. Determine the interval. The barrier control unit controls the barrier so that the light transmission region and the light non-transmission region are arranged at the arrangement interval determined by the barrier display position determination unit.

  In one embodiment, it has become possible to provide a video display device that can enter a large amount of light into the pupil of the observer and suppress the occurrence of display unevenness when the viewing distance changes.

It is a figure for demonstrating the pinhole effect. (A) is a figure which shows the eyeball of the observer who visually recognizes the image displayed on a related video display apparatus and a video display apparatus, (b) is the elements on larger scale surrounded by the broken line in (a), (C) is a figure which shows an observer's pupil. 1 is a perspective view of a video display system according to a first embodiment. FIG. 4 is a block diagram of the video display system shown in FIG. 3. (A) is a disassembled perspective view of the optical device shown in FIG. 3, and (b) is a cross-sectional view of the barrier shown in (a). It is a flowchart which shows the pupil diameter measurement process of the video display apparatus shown in FIG. (A) is a figure which shows the observer's eyeball which visually recognizes the image displayed on the video display apparatus shown in FIG. 3 and the display part of a video display apparatus, (b) is the part enclosed with the broken line in (a) It is an enlarged view, (c) is a figure which shows the relationship between the pitch of a barrier, and an aperture diameter. (A) And (b) is a figure which shows distribution of the light which injects into a pupil when it is 1st visual recognition distance, (c) is a display visually recognized by an observer when it is 1st visual recognition distance. (D) and (e) are diagrams showing the distribution of light incident on the pupil at the second viewing distance, and (f) is the second viewing distance. It is a figure which shows the image of the display part visually recognized by an observer sometimes. (A) And (b) is a figure which shows distribution of the light which injects into a pupil when it is a 3rd visual recognition distance and is a 1st pupil diameter, (c) is a 3rd visual recognition distance, and It is a figure which shows the image of the display part visually recognized by an observer when it is the 1st pupil diameter, (d) and (e) are the 3rd visual recognition distance, and when it is the 2nd pupil diameter It is a figure which shows distribution of the light which injects into a pupil, (f) is a figure which shows the image of the display part visually recognized by an observer when it is the 3rd visual recognition distance and it is the 2nd pupil diameter. (A) is a figure which shows the distribution of the light in a 1st incident state, (b) is a figure which shows the distribution of the light in a 2nd incident state. It is a flowchart which shows the barrier control process of the video display apparatus shown in FIG. (A) is a figure which shows the 1st incident state in case a visual recognition distance is a suitable visual distance, (b) is a figure which shows the 2nd incident state in case a visual recognition distance is an appropriate visual distance, (c ) Is a diagram showing the first incident state when the viewing distance is shorter than the appropriate viewing distance, and (d) is a diagram showing the second incident state when the viewing distance is the distance shown in (c). It is. (A) is an internal functional block diagram of the barrier display position determination unit shown in FIG. 4, and (b) is an internal functional block diagram of the light transmission region interval / repetition count determination unit shown in (a). It is a more detailed flowchart of the process which determines the arrangement interval of the light transmissive area | region shown in FIG. (A) is a block diagram of a video display system according to the second embodiment, (b) is a diagram showing a pupil diameter calculation table shown in (a), and (c) is a barrier position calculation shown in (a). It is a figure which shows a table. It is a figure which shows roughly the simulation which shows the relationship between a visual recognition distance and a visual recognition image. It is a figure which shows a 1st simulation result, (a) shows a 1st pattern, (b) shows a 2nd pattern. It is a figure which shows a 2nd simulation result, (a) shows a 1st pattern and (b) shows a 2nd pattern. (A) is a figure which shows the 1st incident state in case a visual recognition distance is a distance shorter than a suitable visual distance, (b) shows the 2nd incident state in case a visual recognition distance is the distance shown to (a). (C) is a figure which shows a 1st incident state in case a visual recognition distance is a distance longer than an appropriate visual distance, (d) is a case where a visual recognition distance is a distance shown in (c). It is a figure which shows a 2nd incident state.

  Hereinafter, a video display device, a video display system, and a method thereof will be described with reference to the drawings. However, it should be noted that the technical scope of the present invention is not limited to these embodiments, and extends to equivalents to the invention described in the claims.

(Outline of video display device according to embodiment)
The image display device according to the embodiment is based on the pupil diameter of the observer, the thickness and refractive index of the lenticular lens, and the viewing distance, and is assumed to suppress the occurrence of display unevenness at a given viewing distance. Determine the spacing between the areas. Then, the video display device according to the embodiment controls the barrier so that the light transmission region and the light non-transmission region of the barrier are arranged at the determined arrangement interval. In the video display device according to the embodiment, the viewing distance is not an appropriate viewing distance by controlling the barrier so that the arrangement interval of the light transmission regions becomes the arrangement interval estimated to suppress the occurrence of display unevenness. Occurrence of display unevenness can be suppressed.

(Video display device related to the video display device according to the embodiment)
Before describing the video display device according to the embodiment, a video display device related to the video display device according to the embodiment will be briefly described. The related video display apparatus obtains a clear image by applying the pinhole effect shown in FIG. As shown in FIG. 1A, when the diameter of the pupil 901 is increased in order for the observer to view the image 900 in a dark place, the combined range of the captured light spreads on the retina 902, and the image 900 The visual accuracy may be poor. In this case, the observer is less likely to see the image 900 than in a bright environment, and it is difficult to focus on the image 900, so that the viewer visually recognizes an image with a blurred outline or body part that is not clear. Therefore, as shown in FIG. 1B, by arranging a barrier 903 having a width smaller than the pupil diameter of the pupil 901 between the image 900 and the pupil 901, the pinhole effect is applied to the image 900. An image display device that improves the visual accuracy has been found.

  FIG. 2A is a diagram illustrating a related video display device and an eyeball of an observer who visually recognizes an image displayed on the video display device, and FIG. 2B is surrounded by a broken line in FIG. FIG. 2C is a partially enlarged view, and FIG. 2C is a view showing the observer's pupil.

  As shown in FIG. 2A, the video display device 910 includes barrier means 911, a lenticular lens 912, and a display unit 914. The video display device 910 reduces the aperture diameter K of the light LG of the image incident on the eyeball 920 of the observer who visually recognizes the image displayed on the display unit 914 in a predetermined direction smaller than the diameter W of the pupil 921. it's shown. The video display device 910 realizes a pinhole effect that improves the visibility of an image by making the light irradiation width smaller than the diameter W of the pupil 921.

  As shown in FIG. 2B, the barrier means 911 switches the aperture amount of the window portion 913 in the vertical direction with respect to the display surface, so that the aperture diameter with respect to the light irradiation destination depends on the viewing ability of the observer. While adjusting K, the amount of incident light LG is adjusted. In the barrier unit 911, the window portion 913A in a state where the pitch is narrowed and the window portion 913B in a state where the pitch is widened are switched according to the illuminance condition. The window portion 913 may be provided with a mechanism that can adjust the pitch in detail according to the illuminance and the visual recognition ability, or may be a mechanism that switches the pitch step by step for each constant width.

  The lenticular lens 912 refracts the light LG that has passed through the window portion 913 on the convex surface side and collects the light in a predetermined direction. The observer's pupil 921 is irradiated with light LG that passes through the center of curvature RO of the convex portion toward the display surface side of the lenticular lens 912, and the observer enters the pupil 921 via the barrier means 911 and the lenticular lens 912. An image corresponding to the incident light is visually recognized.

  In the video display device 910, the barrier means 911 has a window portion 913 formed in the horizontal direction with respect to the display surface of the display portion 914, and the opening amount is adjusted in the vertical direction. For an observer who visually recognizes the display surface, the light LG emitted from each lenticular lens 912 has a diaphragm diameter K that is narrower than the vertical direction of the pupil 921 as shown in FIG. At this time, in the pupil 921, when the barrier means 911 widens the aperture amount through which light passes according to the illuminance of the display environment, when the aperture diameter KB corresponding to the window portion 913B or the aperture amount is narrowed, the window portion Light is irradiated with an aperture diameter KA corresponding to 913A.

  When a white screen is displayed on the display unit 914, the color is uniform when the viewing distance between the observer using the video display device 910 and the center of curvature RO of the lenticular lens 912 is an appropriate viewing distance. An image that does not cause display unevenness, which is also referred to as moire, is visually recognized by an observer. On the other hand, when the viewing distance between the observer who uses the video display device 910 and the center of curvature RO of the lenticular lens 912 deviates from the appropriate viewing distance, an image having a shaded color, that is, an image with display unevenness is observed. Visible to the person. In other words, when a white screen is displayed on the display unit 914 of the video display device 910, the viewer is determined according to the viewing distance between the pupil of the viewer who uses the video display device 910 and the center of curvature RO of the lenticular lens 912. It has been found that the image visually recognized by is changed. Based on this knowledge, the video display device according to the embodiment allows the viewer to visually recognize an image in which the occurrence of display unevenness is suppressed regardless of the viewing distance between the pupil of the viewer and the center of curvature of the lenticular lens. A video display device is provided.

(Configuration of video display system according to the first embodiment)
FIG. 3 is a perspective view of the video display system according to the first embodiment, and FIG. 4 is a block diagram of the video display system according to the first embodiment.

  The video display system 1 includes a video display device 10 and an optical device 20. The video display device 10 includes a communication unit 11, an operation unit 12, an imaging unit 13, a display unit 14, a storage unit 15, and a processing unit 16. In one example, the video display device 10 is a mobile communication terminal such as a smartphone. The optical device 20 includes a barrier 21 and a lenticular lens 22. The optical device 20 may be fixed to the surface of the display unit 14 and may be detachably disposed on the surface of the display unit 14. Further, the optical device 20 may be included in the video display device 10. When the optical device 20 is included in the video display device 10, the video display system 1 is realized by a single video display device.

  The communication unit 11 includes a communication interface circuit including an antenna mainly having a sensitivity band of 2.1 GHz band, and connects the video display device 10 to a communication network (not shown). The communication unit 11 establishes a radio signal line by a CDMA (Code Division Multiple Access) method or the like with a base station via a channel assigned by a base station (not shown), and performs radio communication with the base station. Do. Then, the communication unit 11 supplies the data received from the base station to the processing unit 16. In addition, the communication unit 11 transmits the data supplied from the processing unit 16 to the base station. The communication unit 11 performs data communication according to the HTTP (Hypertext Transfer Protocol) protocol. The communication unit 11 has a communication interface circuit including an antenna mainly having a 2.4 GHz band as a sensitive band, and does not pass through a base station of a wireless LAN such as Wi-Fi (registered trademark) without passing through the base station. Wireless communication.

  The operation unit 12 may be any device as long as the operation of the video display device 10 is possible, for example, a push switch. The operation unit 12 receives an instruction from the observer, generates a signal corresponding to the received instruction, and outputs the signal to the processing unit 16.

  The imaging unit 13 includes an imaging device arranged in an array and an element driving unit that drives the imaging device. The imaging device includes a charge coupled device (CCD) type sensor or an active pixel sensor (APS) type sensor and a color filter, and accumulates electric charges according to incident light. The element driving unit converts the electric charge accumulated in each of the imaging elements into an electric signal and outputs the electric signal to the processing unit 16.

  The display unit 14 may be any device as long as it can output a moving image, a still image, and the like, and is, for example, a touch panel display device. The display unit 14 displays a moving image corresponding to the moving image data supplied from the processing unit 16, a still image corresponding to the still image data, and the like. The display unit 14 receives an observer's instruction by touch such as tapping, dragging, and flicking, generates a signal corresponding to the received instruction, and outputs the signal to the processing unit 16. The display unit 14 can display monochromatic light such as white or gray.

  The storage unit 15 includes, for example, a semiconductor memory. The storage unit 15 stores a driver program, an operating system program, an application program, data, and the like used for processing in the processing unit 16. For example, the storage unit 15 stores a mobile phone communication device driver program that controls the communication unit 11, an input device driver program that controls the operation unit 12, an output device driver program that controls the display unit 14, and the like as driver programs. In addition, the storage unit 15 stores, as an operating system program, a connection control program that executes a short-range wireless communication method such as the Bluetooth (registered trademark) standard, a connection control program for a mobile phone and a wireless LAN, and the like. The storage unit 15 stores various programs including a pupil diameter measurement program for executing the pupil diameter measurement process and a barrier control program for executing the barrier control process as application programs. The computer program may be installed in the storage unit 15 using a known setup program or the like from a computer-readable portable recording medium such as a semiconductor memory including a flash memory.

  In addition, the storage unit 15 stores data used in pupil diameter measurement processing such as the thickness of the lenticular lens 22, the refractive index of the lenticular lens 22, and the pupil diameter of the observer, and barrier control processing as data. Furthermore, the storage unit 15 may temporarily store data that is temporarily used in processing such as pupil diameter measurement processing and barrier control processing.

  The processing unit 16 includes one or a plurality of processors and their peripheral circuits. The processing unit 16 controls the overall operation of the video display device 10 and is, for example, a CPU (Central Processing Unit). The processing unit 16 is configured so that various processes of the video display device 10 are executed in an appropriate procedure in accordance with a program stored in the storage unit 15, operations of the operation unit 12 and the display unit 14, and the like. The operation of the imaging unit 13 or the like is controlled. The processing unit 16 executes processing based on programs (driver program, operating system program, application program, etc.) stored in the storage unit 15. The processing unit 16 can execute a plurality of programs (such as application programs) in parallel.

  The processing unit 16 includes an instruction acquisition unit 161, a display instruction unit 162, a distance determination unit 163, a pupil diameter determination unit 164, a barrier display position determination unit 167, and a barrier control unit 168. The pupil diameter determining unit 164 includes a diaphragm diameter calculating unit 165 and a pupil diameter calculating unit 166. Each of these units included in the processing unit 16 is a functional module implemented by a program executed on a processor included in the processing unit 16. Each of these units included in the processing unit 16 may be mounted on the video display device 10 as an independent integrated circuit, a microprocessor, or firmware.

  FIG. 5A is an exploded perspective view of the optical device 20, and FIG. 5B is a cross-sectional view of the barrier 21.

  The barrier 21 includes a plurality of light transmission regions 23 that transmit light displayed by the display unit 14 and a plurality of light non-transmission regions 24 that do not transmit light, and light that has passed through each of the plurality of light transmission regions 23. Is emitted to the lenticular lens 22. The light transmissive regions 23 and the light non-transmissive regions 24 are alternately formed in parallel so as to extend in the Y direction, and light transmitted through the light transmissive regions 23 is arranged at intervals between the lenticular lens 22 and the light transmissive regions 23. Output at corresponding intervals.

  The barrier 21 includes an upper polarizing plate 211, an upper glass substrate 212, an upper electrode 213, a liquid crystal layer 214, a lower electrode 215, a lower glass substrate 216, and a lower polarizing plate 217. The upper polarizing plate 211, the upper glass substrate 212, the upper electrode 213, the liquid crystal layer 214, the lower electrode 215, the lower glass substrate 216, and the lower polarizing plate 217 are sequentially stacked.

  The barrier 21 can generate a light transmission region 23 and a light non-transmission region 24 of any shape in the liquid crystal layer 214 by selectively applying a voltage between the upper electrode 213 and the lower electrode 215. . The barrier 21 is configured such that a plurality of light transmission regions 23 and a plurality of light non-transmission regions 24 are alternately arranged at a desired arrangement interval by selectively applying a voltage between the upper electrode 213 and the lower electrode 215. can do.

  The lenticular lens 22 is disposed on the display surface of the display unit 14 through the barrier 21, collects the light emitted from the display unit 14 and transmitted through the light transmission region 23 of the barrier 21 in the X direction, and emits the light in the Z direction. . In the lenticular lens 22, the shape of the back surface facing the display unit 14 is a flat surface, and the surface opposite to the surface facing the display unit 14 has a convex portion having a cylindrical cross-section (Cylindrical) in a constant cycle. It is a lens formed automatically. In other words, the lenticular lens 22 has a convex surface portion continuously formed in the X direction on the surface that is positioned in the Z direction as viewed by an observer and extends in the Y direction. The convex surface portion of the lenticular lens 22 has a formation area set based on a predetermined number of pixels, for example, with respect to the display unit 14 or a displayed image.

  The lenticular lens 22 irradiates light gathered for each range in which the convex surface portion is formed to the viewer side, and thereby irradiates light that is more concentrated than when the planar display portion 14 is viewed. In addition, the lenticular lens 22 changes the irradiation angle of light applied to the eyeball side according to the difference in the viewing angle and distance with respect to the display unit 14.

(Pupil diameter measurement processing by video display device)
In order to provide an observer with an image in which the occurrence of display unevenness is suppressed regardless of the viewing distance, the video display device 10 first executes a pupil diameter measurement process for measuring the pupil diameter of the observer who visually recognizes the image. . The pupil diameter measurement process is performed when the observer starts viewing the image displayed on the display unit 14 of the video display device 10 or when the ambient light around the video display device 10 changes. It is executed when it is estimated that has changed.

  FIG. 6 is a flowchart showing the pupil diameter measurement process of the video display device 10.

The display instruction unit 162 displays a white screen on the display unit 14 in response to an instruction to start the process of measuring the pupil diameter via the operation unit 12 or the display unit 14 that is a touch panel (S101). An observer who visually recognizes an image displayed on the display unit 14 operates the operation unit 12 while visually recognizing that the image displayed on the display unit 14 is an image having no display unevenness and having a uniform color. Accordingly, the instruction acquisition unit 161 acquires a distance measurement start instruction (S102). Next, the distance determination unit 163 images the face of the observer with the imaging unit 13 (S103). The distance determination unit 163 uses the captured facial image to determine the distance between the center of curvature of the lenticular lens 22 and the observer's pupil when the viewer determines that the image displayed on the display unit 14 is uniform. An appropriate viewing distance, which is a distance, is calculated (S104). Next, the aperture diameter calculator 165 calculates the aperture diameter H ₁ and the viewpoint interval H ₂ in the observer's pupil (S105). The aperture diameter H ₁ is the diameter of the entrance surface of the pupil 81 of light that passes through the light transmission region 23 of the barrier 21 and enters the pupil 81 from the single lenticular lens 22. The viewpoint interval H ₂ is an interval in the pupil 81 of light that enters the pupil 81 from two adjacent lenticular lenses 22.

  FIG. 7A is a diagram showing an eyeball of an observer who visually recognizes an image displayed on the video display device 10 and the display unit 14 of the video display device 10, and FIG. 7B is a broken line in FIG. FIG. 7C is a diagram showing the relationship between the barrier pitch and the aperture diameter.

The aperture diameter H ₁ is a viewing distance X that is the distance between the center of curvature R 0 of the lenticular lens 22 and the pupil 81 of the observer, the thickness t of the lenticular lens 22, the refractive index n of the lenticular lens 22, and the light transmission of the barrier 21. Using the similarity of triangles by the width ΔP of the region 23,
H ₁ = ΔP × X × (n / t) (Formula 1)
Indicated by On the other hand, the viewpoint interval H ₂ similarly uses the similarity of the triangle by the viewing distance X, the thickness t, the refractive index n, and the interval P of the light transmission region 23 of the barrier 21,
H ₂ = P × X × (n / t) (Formula 2)
Indicated by Here, if the interval P of the light transmission region 23 of the barrier 21 is m times the width ΔP of the light transmission region 23 of the barrier 21, the viewpoint interval H ₂ is given by
H ₂ = m × ΔP × X × (n / t) (Formula 3)
Indicated by

The aperture diameter calculation unit 165 includes the thickness t of the lenticular lens 22 stored in the storage unit 15, the refractive index n of the lenticular lens 22, the width ΔP of the light transmission region 23 of the barrier 21, and the distance X calculated by the distance determination unit 163. Is used to calculate the aperture diameter H _{1 according} to equation (1). In addition, the aperture diameter calculation unit 165 further calculates the viewpoint interval H ₂ using Equation 3 by further using a multiple m of the interval P of the light transmission region 23 of the barrier 21 with respect to the width ΔP of the light transmission region 23.

Next, the pupil diameter calculation unit 166 calculates the pupil diameter using the aperture diameter H ₁ and the viewpoint interval H ₂ calculated by the aperture diameter calculation unit 165. The pupil diameter calculation unit 166 uses the aperture diameter H ₁ and the viewpoint interval H ₂ , and the amount of light incident on the pupil 81 in the first incident state and the area of the pupil 81 where the light enters are in the first incident state. The amount of light in the second incident state, which is different from the area of the pupil 81 where light enters, is calculated. The first incident state is a state in which light from any one of the lenticular lenses 22 in which the center of the pupil 81 of the observer coincides with the center of the light incident on the pupil 81 enters the entire pupil 81. is there. Further, in the second incident state, light in which the center of the observer's pupil 81 and the center between the two lights incident on the pupil 81 from two adjacent lenses of the lenticular lens 22 coincide with the entire pupil 81. It is in a state of being incident over. The pupil diameter calculator 166 determines the pupil diameter when the light amount in the first incident state and the light amount in the second incident state coincide with each other as the pupil diameter of the observer.

FIGS. 8A and 8B are diagrams showing the distribution of light incident on the pupil 81 when the viewing distance is X ₁ , and FIG. 8C shows the viewer when the viewing distance is X _1. It is a figure which shows the image of the display part 14 visually recognized. 8D and 8E are diagrams showing the distribution of light incident on the pupil 81 when X ₂ is different from the viewing distance X _1, and FIG. 8F is the viewing distance X ₂ . It is a figure which shows the image of the display part 14 visually recognized by an observer sometimes. 8A and 8D show the first incident state, and FIGS. 8B and 8E show the second incident state. In FIGS. 8A, 8B, 8D, and 8E, white indicates a portion where light is incident and black indicates a portion where light is not incident.

As shown in FIG. 8 (c), when a visible distance X _1, since the light of uniform light intensity over the entire observer retina enters the observer, uniform without display unevenness It is visually recognized that an image having a color is displayed on the display unit 14. That is, in the case of FIGS. 8A and 8B where the regions of the pupil 81 where light enters are different, light of the same amount of light enters the retina.

On the other hand, as shown in FIG. 8 (f), when the viewing distance is X ₂ , light with different amounts of light enters the viewer's retina, so that the viewer has an image with uneven display and shades of color. It is visually recognized as being displayed on the display unit 14. That is, light having different amounts of light is incident on the retina in the case of FIG. 8D and the case of FIG.

9A and 9B show the distribution of light incident on the pupil 81 when the viewing distance is X ₃ and the pupil diameter of the observer is D ₁ , and FIG. 9C shows the distribution in this case. The image of the display part 14 visually recognized by an observer is shown. FIGS. 9D and 9E show the distribution of light incident on the pupil 81 when the viewing distance is X ₃ and the observer's pupil diameter is D ₂ different from D ₁ . ) Shows an image of the display unit 14 visually recognized by an observer in this case. 9 (a) and 9 (d) show the light distribution in the first incident state, and FIGS. 9 (b) and 9 (e) show the light distribution in the second incident state. 9A, 9B, 9D, and 9E, white indicates a portion where light is incident, and black indicates a portion where no light is incident.

As shown in FIG. 9C, when the viewing distance is X ₃ and the pupil diameter of the observer is D ₁ , light with a uniform amount of light is incident on the entire retina of the observer. It is visually recognized that display unevenness does not occur and an image is displayed on the display unit 14. That is, in the case of FIGS. 9A and 9B, light having the same amount of light enters the retina.

On the other hand, as shown in FIG. 9 (f), when the viewing distance is X ₃ and the pupil diameter of the observer is D ₂ , light having a different light amount enters the observer's retina. It is visually recognized that an image with unevenness and shades of colors is displayed on the display unit 14. That is, even when the viewing distance is the same, if the pupil diameter of the observer changes, the image visually recognized by the observer will be different.

FIG. 10A is a diagram showing the light distribution in the first incident state, and FIG. 10B is a diagram showing the light distribution in the second incident state. 10A and 10B, the pupil diameter is D, the aperture diameter is H ₁ , and the viewpoint interval is H ₂ .

The pupil diameter calculator 166
-sqrt (D ² /4-x ² ) ≤ y <sqrt (D ² /4-x ² ) (Formula 4)
The pupil diameter D is changed in the range of the first incident light amount E ₁ that is the amount of light incident on the pupil 81 in the first incident state shown in FIG. 10A and the second incident state shown in FIG. Is compared with the second light quantity E ₂ which is the quantity of light incident on the pupil 81. Since the pupil 81 has a circular shape, the range of the pupil diameter D is changed within the range indicated by (Expression 4).

The first light quantity E ₁ is
E ₁ = ΣI (x, y) × J ₁ (x, y) (Formula 5)
Indicated by Where I (x, y) is
I (x, y) = 10 - p (x2 + y2) ( Equation 6)
Indicated by Here, the constant p is 0.066. I (x, y) is a function indicating the Stiles-Crawford Effect in which the efficiency of light decreases as the distance from the center of the pupil 81 becomes concentric. J ₁ (x, y) corresponds to the distribution of light incident on the pupil 81 in the case of FIG.
_{J 1 (x, y) =} 1 ( when _{-H 1/2 ≦ y <H} 1/2) ( Equation 7)
_{0 (-H 1/2 ≦ y} <H 1/2 not equal)
Indicated by

The second light quantity E ₂ is
E ₂ = ΣI (x, y) × J ₂ (x, y) (Formula 8)
Indicated by Here, I (x, y) is expressed by (Equation 6). J ₂ (x, y) corresponds to the distribution of light incident on the pupil 81 in the case of FIG.
J ₂ (x, y) = 1
(-D / 2 ≦ y <When -H _3/2 and _{H 3/2 ≦ y <D} / 2)
0 (-D / 2 ≦ y < -H 3/2 or _{H 3/2 ≦ y <D} / 2 not equal)
(Formula 9)
Indicated by Here, H ₃ is the width of the light opaque region 24 and is a value obtained by subtracting the aperture diameter H ₁ from the viewpoint interval H ₂ (H ₃ = H ₂ −H ₁ ).

The pupil diameter calculator 166 determines the pupil diameter D when the first light quantity E ₁ and the second light quantity E ₂ coincide with each other as the observer's pupil diameter (S106).

(Barrier control processing by video display device)
FIG. 11 is a flowchart showing the barrier control process of the video display device 10. The video display device 10 performs the barrier control process, and thus it is estimated that the occurrence of display unevenness is suppressed at the viewing distance when the viewer is viewing the image displayed on the display unit 14. The arrangement interval of the region 23 is determined. The barrier control process is executed at regular intervals while the observer visually recognizes the image displayed on the display unit 14.

  First, the distance determination unit 163 images the face of the observer with the imaging unit 13 (S201). Next, the distance determination unit 163 calculates a viewing distance, which is a current distance between the center of curvature of the lenticular lens 22 and the pupil of the observer, using the captured facial image (S202).

  Next, the barrier display position determination unit 167 determines an arrangement interval of the light transmission regions 23 that is estimated to suppress display unevenness at the viewing distance (S203). The barrier display position determination unit 167 is based on the pupil diameter of the observer, the thickness and refractive index of the lenticular lens 22, the viewing distance, the pixel pitch of the display unit 14, and the width of the light transmission region 23 of the barrier. Determine the arrangement interval.

  FIG. 12A is a diagram showing a first incident state when the viewing distance is an appropriate viewing distance, and FIG. 12B is a diagram showing a second incident state when the viewing distance is an appropriate viewing distance. is there. FIG. 12C is a diagram showing the first incident state when the viewing distance is shorter than the appropriate viewing distance, and FIG. 12D is the case where the viewing distance is the distance shown in FIG. It is a figure which shows the 2nd incident state. Here, the first incident state is a state in which light from any one of the lenticular lenses in which the center of the observer's pupil coincides with the center of the light incident on the pupil enters the entire pupil. . In the second incident state, light in which the center of the observer's pupil coincides with the center between the two lights incident on the pupil from two adjacent lenses of the lenticular lens enters the entire pupil. State. In each of FIGS. 12A to 12D, the light transmission region 23 has not changed the arrangement interval since the pupil diameter determining unit 164 calculates the pupil diameter of the observer.

  As shown in FIGS. 12 (a) and 12 (b), when the viewing distance is the appropriate viewing distance I, the amount of light incident on the observer's pupil matches between the first incident state and the second incident state. To do. Since the amount of light incident on the pupil of the observer matches between the first incident state and the second incident state, display unevenness does not occur when the viewing distance is the appropriate viewing distance I.

  As shown in FIGS. 12C and 12D, when the viewing distance is a distance X shorter than the appropriate viewing distance I, the amount of light incident on the observer's pupil is the first amount than in the first incident state. There are more in the two incident state. Since the second incident state is larger than the first incident state, display unevenness occurs when the viewing distance is the distance X shorter than the appropriate viewing distance I. Similarly, when the viewing distance X is longer than the appropriate viewing distance I, the second incident state is smaller than the first incident state, and display unevenness occurs.

  13A is an internal functional block diagram of the barrier display position determining unit 167, and FIG. 13B is an internal functional block diagram of the light transmission region interval / repetition count determining unit inside the barrier display position determining unit 167. is there. FIG. 14 is a more detailed flowchart of the process of S203.

  The barrier display position determination unit 167 includes a light transmission region interval / repetition count determination unit 1671 and a barrier display position determination unit 1672. The light transmission region interval / repetition count determination unit 1671 includes a repetition number calculation unit 1673 and a light transmission region interval calculation unit 1673.

The number-of-repetitions calculation unit 1673 uses the first light amount F ₁ when the viewing distance is different from the appropriate viewing distance I, and the light amount incident on the pupil 81 when the viewing distance is the distance X. A certain second light quantity F ₂ is compared (S301).

As shown in Equation 1, since the aperture diameter is proportional to the viewing distance, when the aperture diameter when the viewing distance is the appropriate viewing distance I is H ₁ , the aperture diameter H ′ ₁ when the viewing distance is the distance X. Is
H ′ ₁ = (X / I) × H ₁ (Formula 10)
Indicated by

The first light quantity F ₁ is calculated from Equation 5 to Equation 7 and Equation 10.
F ₁ = ΣI (x, y) × J ′ ₁ (x, y) (Formula 11)
_{J'1 (x, y) =} 1 (- (X / I) H 1/2 ≦ y <(X / I) when H _1/2)
0 (- (X / I) H 1/2 ≦ y <(X / I) H 1/2 not equal)
(Formula 12)
Indicated by Here, I (x, y) is expressed by (Equation 6).

The second light quantity F ₂ can be calculated from Equations 8 to 10.
F ₂ = ΣI (x, y) × J ′ ₂ (x, y) (Formula 13)
J ′ ₂ (x, y) = 1 (Formula 14)
(-D / 2 ≦ y <- (X / I) H 3/2 and (X / I) when the _{H 3/2 ≦ y <D} / 2)
0 (-D / 2 ≦ y < - (X / I) H 3/2
Or _{(X / I) H 3/} 2 ≦ y < not equal D / 2)
Indicated by Here, I (x, y) is expressed by (Equation 6). The viewpoint interval H ₂ is determined from the aperture diameter H ₁ and the width H ₃ of the light-impermeable region 24.
H ₂ = H ₁ + H ₃ (Formula 15)
Indicated by On the other hand, the viewpoint interval H ₂ is given by the following equation (2):
H ₂ = P × I × (n / t) (Formula 16)
Indicated by Furthermore, when the light transmission region 23 is repeatedly arranged N times at the pixel pitch L of the display unit 14, the pixel pitch L of the display unit 14 is
L = N × P (Formula 17)
Indicated by From Expression 15 to Expression 17, the width H ₃ of the light opaque region 24 is
H ₃ = H ₂ -H _{1
= (NLI / Nt) -H 1} ( Equation 18)
Indicated by By substituting equation 18 into equation 14,
J ′ ₂ (x, y) = 1 (Formula 19)
(−D / 2 ≦ y <− (nLX / Nt− (X / I) H ₁ ) / 2
And (when nLX / Nt− (X / I) H ₁ ) / 2 ≦ y <D / 2)
0 (−D / 2 ≦ y <− (nLX / Nt− (X / I) H ₁ ) / 2
Or (when nLX / Nt− (X / I) H ₁ ) / 2 ≦ y <D / 2)
It becomes.
Furthermore, from (Equation 1), since H ₁ = ΔP × I × (n / t),
J ′ ₂ (x, y) = 1
(−D / 2 ≦ y <− (nLX / Nt−ΔP × X × n / t) / 2
And (when nLX / Nt−ΔP × X × n / t) / 2 ≦ y <D / 2)
0 (−D / 2 ≦ y <− (nLX / Nt−ΔP × X × n / t) / 2
Or (when nLX / Nt−ΔP × X × n / t) / 2 ≦ y <D / 2)
And deformed. (Equation 12) can also be modified as follows.
J ′ ₁ (x, y) = 1 (when − (ΔP × X × n / t) / 2 ≦ y <(ΔP × X × n / t) / 2)
0 (-(ΔP × X × n / t) / 2 ≦ y <(when (ΔP × X × n / t) / 2 is not satisfied)

The number-of-repetitions calculation unit 1673 uses Equation 6, Equation 11, Equation 12, Equation 13, and Equation 19 to calculate the difference (| F ₁ −F ₂ |) between the first light amount F ₁ and the second light amount F _2. The number N of repetitions to be minimized is determined (S302). Next, the light transmission region interval calculation unit 1673 determines the interval P of the light transmission region 23 of the barrier 21 from Expression 17 using the determined number of repetitions N (S303). Then, the barrier display position determination unit 1672 determines the barrier display position using the determined repetition count N and the interval P between the light transmission regions 23. The barrier display position determination unit 167 suppresses the occurrence of display unevenness at the viewing distance X by determining the interval P of the light transmission region 23 in which the difference between the first light amount F ₁ and the second light amount F ₂ is minimized. The barrier display position including the arrangement interval of the light transmission regions 23 estimated to be performed is determined.

The barrier control unit 168 controls the barrier 21 so that the light transmission regions 23 are arranged at the arrangement interval determined by the barrier display position determination unit 167 (S204). The barrier control unit 168 fixes the width ΔP of the light transmission region 23 and changes the width of the light non-transmission region 24 so that the interval between the light transmission regions 23 becomes P determined by the barrier display position determination unit 167.
(Configuration of Video Display Device According to Second Embodiment)
FIG. 15A is a block diagram of a video display apparatus according to the second embodiment, FIG. 15B is a diagram showing a pupil diameter calculation table shown in FIG. 15A, and FIG. It is a figure which shows the barrier position calculation table shown to Fig.15 (a).

  The video display system 2 is different from the video display system 1 according to the first embodiment in that a video display device 30 is arranged instead of the video display device 10. The video display device 30 includes a processing unit 17 having a pupil diameter determining unit 174 and a barrier display position determining unit 177 instead of the processing unit 16 having the pupil diameter determining unit 164 and the barrier display position determining unit 167. This is different from the video display device 10. Since the configuration of the video display system 2 other than the pupil diameter determining unit 174 and the barrier display position determining unit 177 has the same configuration and function as the configuration of the video display system 1 according to the first embodiment to which the corresponding reference numerals are attached. Detailed description is omitted here.

  The pupil diameter determining unit 174 has a pupil diameter calculation table 175. The pupil diameter calculation table 175 is calculated using Expressions 1 to 9 based on the viewing distance X when the viewer visually recognizes that the image has a uniform color without display unevenness and the viewing distance X. The relationship with the pupil diameter D made is shown. The pupil diameter determination unit 174 uses the pupil distance calculation table 175 to determine the pupil distance from the visual distance X between the curvature center of the lenticular lens 22 calculated by the distance determination unit 163 and the pupil of the observer. The diameter D is determined.

  The barrier display position determination unit 177 has a barrier position calculation table 178. The barrier position calculation table 178 includes the pupil diameter D determined by the pupil diameter determination unit 174, the visual recognition distance X, and the number of repetitions N calculated using Expression 6, Expression 11, Expression 12, Expression 13, and Expression 19. Show the relationship. The barrier display position determination unit 177 determines the number of repetitions N from the pupil diameter D determined by the pupil diameter determination unit 174 and the viewing distance X determined by the distance determination unit 163.

(Relationship between viewing distance and viewing image)
The relationship between the viewing distance and the viewing image was examined by simulation. The simulation conditions are as follows.
Horizontal size of the image: 11520 (pixels)
1 pixel width: 0.004775 (mm) (actual screen size = 55.008000 (mm), 12 pixels (0.0573 mm) corresponds to 1 pixel of actual screen)
Center of curvature (distance to pixel): 1.85923 (mm) (Lenticular lens thickness is 2.72 mm, refractive index is 1.46297, calculated from center of curvature = thickness / refractive index)
Distance between the centers of curvature: 0.057030 (mm)
Number of curvature centers: 964 (pieces) (actual size of lenticular lens: 55.005435 (mm))
Aperture diameter of lenticular lens: 1.0mm
Lenticular lens aperture spacing: 3.0mm
As shown in FIG. 16, in the simulation, the pupil is sampled at 100 points, and the retina is determined depending on whether or not there is a pixel as a light source ahead of the line connecting the curvature center R0 of the lenticular lens and the pupil. Calculate the illuminance above. That is, the illuminance on the retina is
Illuminance = ΣI (x, y) × M (x, y) / ΣI (x, y) (Formula 20)
x ² + y ² ≤ (square of pupil radius)
Indicated by Here, I (x, y) is expressed by (Equation 6). M (x, y) is “1” when there is a pixel ahead of the line connecting the curvature center R0 of the lenticular lens and the pupil, and the line connecting the curvature center R0 of the lenticular lens and the pupil is extended. When there is no pixel ahead, it is “0”. In the simulation, an image was generated by changing the pupil diameter from 2.5 mm to 3.5 mm. The viewing distance of the first simulation is 31 cm, and the viewing distance of the second simulation is 33 cm. Each of the first simulation and the second simulation includes a first pattern in which the number of repetitions N is 4, and a second pattern in which the number of repetitions N is 3.

  FIG. 17 is a diagram showing the first simulation result, and FIG. 18 is a diagram showing the second simulation result. Each of FIGS. 17A and 18A shows a first pattern in which the number of repetitions N is 4, and each of FIGS. 17B and 18B has a number of repetitions N of 3. A 2nd pattern is shown.

  In the first simulation, the first pattern in which the pupil diameter is in the range of 2.5 mm to 3.0 mm and the number of repetitions N is 4, the occurrence of display unevenness is greater than the second pattern in which the number of repetitions N is 3. Is suppressed. On the other hand, in the second pattern in which the pupil diameter is in the range of 3.1 mm to 3.5 mm and the number of repetitions N is 3, the occurrence of display unevenness is suppressed compared to the first pattern in which the number of repetitions N is 4. .

  In the second simulation, the first pattern in which the pupil diameter is in the range of 2.5 mm to 3.2 mm and the number of repetitions N is 4, the occurrence of display unevenness is greater than the second pattern in which the number of repetitions N is 3. Is suppressed. On the other hand, in the second pattern in which the pupil diameter is in the range of 3.3 mm to 3.5 mm and the number of repetitions N is 3, the occurrence of display unevenness is suppressed compared to the first pattern in which the number of repetitions N is 4. .

(Operational effect of the video display device according to the embodiment)
In the video display device according to the embodiment, the viewing distance is appropriately determined by controlling the barrier so that the arrangement interval of the light transmission regions becomes the arrangement interval estimated to suppress the occurrence of display unevenness at the viewing distance. It suppresses the occurrence of display unevenness when it is not the distance.

  In addition, the video display device according to the embodiment has the light amount incident on the pupil in the first incident state and the light incident on the pupil in the second incident state where the area of the pupil where the light is incident is different from the first incident state. The arrangement interval of the light transmission regions is determined so as to minimize the difference from the amount of light. This makes it possible to easily and easily suppress the occurrence of display unevenness by using the fact that an image viewed through the barrier and the lenticular lens changes according to the viewing distance and the pupil diameter. Can be determined. In one example, the first incident state is a state in which light from any one of the lenticular lenses in which the center of the pupil coincides with the center of the light incident on the pupil enters the entire pupil. Further, the second incident state is a state in which light in which the center of the pupil coincides with the center between two lights incident on the pupil from two adjacent lenses of the lenticular lens enters the entire pupil. . In the video display device according to the second embodiment, the arrangement interval of the light transmission regions can be measured more quickly by using the barrier position calculation table indicating the relationship between the viewing distance, the pupil diameter, and the number of repetitions.

  In addition, the image display device according to the embodiment can suppress the occurrence of display unevenness when the viewing distance is not the appropriate viewing distance without changing the width of the light transmission region, so that the effect of the diaphragm is weakened. It is not, and there is no risk of increasing power consumption.

  FIG. 19A is a diagram showing the first incident state when the viewing distance is shorter than the appropriate viewing distance, and FIG. 19B is the case where the viewing distance is the distance shown in FIG. It is a figure which shows the 2nd incident state. FIG. 19C is a diagram showing the first incident state when the viewing distance is longer than the appropriate viewing distance, and FIG. 19D is the case where the viewing distance is the distance shown in FIG. 19C. It is a figure which shows the 2nd incident state. In the second incident state, light in which the center of the observer's pupil coincides with the center between the two lights incident on the pupil from two adjacent lenses of the lenticular lens enters the entire pupil. State. In each of FIGS. 19A to 19D, the light transmission region 23 does not change the arrangement interval since the pupil diameter determining unit 164 or 174 calculates the pupil diameter of the observer.

As shown in FIGS. 19 (a) and 19 (b), when the recognized distance is a short distance X ₁ than proper viewing distance, the amount of light incident on the observer's pupil, the than the first incident state There are more in the two incident state. In order to make the light quantity in the first incident state coincide with the light quantity in the second incident state, if the width of the light transmission region is widened, the amount of increase in the light quantity in the first incident state compared to the amount of increase in the light quantity in the second incident state. Since the amount of light in the first incident state and the amount of light in the second incident state approach the same amount, the effect of the diaphragm is weakened and the blur is increased.

As shown in FIG. 19 (c) and 19 (d), when the viewing distance is long distance X ₂ than proper viewing distance, the amount of light incident on the observer's pupil, the than the first incident state There are fewer in the 2-incident state. If the width of the light transmission region is narrowed in order to make the light quantity in the first incident state coincide with the light quantity in the second incident state, the amount of decrease in the light quantity in the first incident state compared to the amount of decrease in the light quantity in the second incident state. Since the amount of light in the first incident state and the amount of light in the second incident state approach the same amount, the screen becomes dark. If the screen brightness is increased to prevent the screen from becoming dark, the power consumption of the video display device increases.

(Modification of Video Display Device According to Embodiment)
In the image display apparatus described, the display unit 14 displays white light when measuring the pupil diameter. However, if the display unit displays monochromatic light of another color such as gray light, the pupil diameter is set. Can be measured. In the image display apparatus described, the optical device 20 is disposed over substantially the entire surface of the display unit 14. If the optical device is disposed on at least a part of the display unit, the pupil diameter is measured. be able to.

  In the image display device described, the barrier display position determination unit determines the arrangement interval of the light transmission regions using the pupil diameter determined by the pupil diameter determination unit, but the barrier display position determination unit The pupil diameter obtained by the method or other apparatus may be used. For example, the barrier display position determination unit may acquire the pupil diameter acquired by the dedicated pupil diameter measurement device and determine the arrangement interval of the light transmission regions.

  In the described video display device, the barrier display position determination unit determines the arrangement interval of the light transmission regions by changing the width of the light transmission regions while fixing the width of the light transmission region. The width of the light transmission region may be changed within a range that does not affect the power consumption.

  In the image display apparatus described, the barrier has a structure as described with reference to FIG. 5B, but may have other structures as described in Patent Documents 4 to 6.

DESCRIPTION OF SYMBOLS 1, 2 Video display system 10, 30 Video display apparatus 21 Barrier 22 Lenticular lens 161 Instruction acquisition part 162 Display instruction | indication part 163 Distance determination part 164,174 Pupil diameter determination part 165 Diaphragm diameter calculation part 166 Pupil diameter calculation part 167,177 Barrier Display determination unit 168 Barrier control unit

Claims (6)

A display unit;
A plurality of light-transmitting regions that are arranged so that one surface faces the surface of the display unit, and transmits light displayed by the display unit to the other surface opposite to the one surface, and light that does not transmit light Barriers capable of alternately arranging impermeable regions at desired arrangement intervals;
A lenticular lens that is arranged on the other surface of the barrier and emits the light transmitted through the plurality of light transmission regions;
A pupil diameter determining unit for determining a pupil diameter of an observer viewing the display unit;
A distance determining unit that determines a visual distance between the center of curvature of the lenticular lens and the pupil of the observer;
Based on the thickness and refractive index of the lenticular lens, the pupil diameter, the pixel pitch of the display unit, the width of the light transmission region, and the viewing distance, it is estimated that the occurrence of display unevenness at the viewing distance is suppressed. A barrier display position determination unit for determining an arrangement interval of the light transmission regions;
A barrier control unit that controls the barrier so that the light transmission regions are arranged at an arrangement interval determined by the barrier display position determination unit;
A video display device. The display unit can display monochromatic light,
When the pupil diameter determining unit determines that the image displayed on the display unit has a uniform color when monochromatic light is incident on the pupil of the viewer from the lenticular lens. The pupil diameter of the observer is determined based on an appropriate viewing distance that is the distance between the center of curvature of the lenticular lens and the pupil, the width and arrangement interval of the light transmission region, and the thickness and refractive index of the lenticular lens. The video display device according to claim 1.   The barrier display position determination unit is configured such that the amount of light incident on the pupil in the first incident state is different from the pupil region in which light is incident in the first incident state and the pupil region in which light is incident. The video display device according to claim 1, wherein an arrangement interval of the light transmission regions is determined so as to minimize a difference from a light amount incident on the pupil in an incident state. The first incident state is a state in which light from any one of the lenticular lenses in which the center of the pupil coincides with the center of light incident on the pupil is incident on the entire pupil.
In the second incident state, light in which the center of the pupil coincides with the center between two lights incident on the pupil from two adjacent lenses of the lenticular lens enters the entire pupil. The video display device according to claim 3 which is in a state. A video display device having a display unit;
A plurality of light-transmitting regions that are arranged so that one surface faces the surface of the display unit, and transmits light displayed by the display unit to the other surface opposite to the one surface, and light that does not transmit light A barrier capable of alternately arranging non-transparent areas at a desired arrangement interval; and a lenticular lens arranged on the other surface of the barrier and emitting so as to collect light transmitted through the plurality of light transmissive areas. An optical device having
The video display device
A pupil diameter determining unit for determining a pupil diameter of an observer viewing the display unit;
A distance determining unit that determines a visual distance between the center of curvature of the lenticular lens and the pupil of the observer;
Based on the thickness and refractive index of the lenticular lens, the pupil diameter, the pixel pitch of the display unit, the width of the light transmission region, and the viewing distance, it is estimated that the occurrence of display unevenness at the viewing distance is suppressed. A barrier display position determination unit for determining an arrangement interval of the light transmission regions;
A barrier control unit that controls the barrier so that the light transmission regions are arranged at an arrangement interval determined by the barrier display position determination unit;
A video display system further comprising: A barrier capable of alternately arranging a plurality of light transmission regions that transmit light incident on one surface to the other surface opposite to the one surface and light non-transmission regions that do not transmit light at desired arrangement intervals; Determining a pupil diameter of an observer who visually recognizes a display unit arranged on the surface and a lenticular lens arranged on the other surface of the barrier and emitting so as to collect light transmitted through the plurality of transmission regions. ,
Determining the viewing distance between the center of curvature of the lenticular lens and the pupil of the observer;
Based on the thickness and refractive index of the lenticular lens, the pupil diameter, the pixel pitch of the display unit, the width of the light transmission region, and the viewing distance, it is estimated that the occurrence of display unevenness at the viewing distance is suppressed. Determining an interval between the light transmission regions;
Controlling the barrier so that the light transmission regions are arranged at determined arrangement intervals;
A method involving that.