WO2018116519A1

WO2018116519A1 - Head-mounted display

Info

Publication number: WO2018116519A1
Application number: PCT/JP2017/029078
Authority: WO
Inventors: 宏征高橋
Original assignee: ブラザー工業株式会社
Priority date: 2016-12-20
Filing date: 2017-08-10
Publication date: 2018-06-28
Also published as: JP6540676B2; JP2018101051A

Abstract

The present invention provides a head-mounted display capable of suppressing a decrease in visual recognizability by a user in response to a change in a positional relationship between an eye of the user and a display part. An HMD 1 is characterized by being provided with: a display device 2 having a liquid crystal panel 2A on which a color image is displayed by controlling the output timings of RGB lights; a mounting part 11 that is a member for mounting the display device 2 on a head of a user, and includes at least a first ball joint 6 and a second ball joint 7 that are capable of adjusting the position of the display device 2 with respect to the eye of the user; an FPGA for detecting a positional relationship between the eye of the user and the display device 2; and a CPU for displaying an image on the liquid crystal panel 2A in a display method for outputting RGB lights at output timings corresponding to the positional relationship detected by the FPGA.

Description

Head mounted display

This disclosure relates to a head mounted display.

A display phenomenon that reduces the visibility of the user may occur according to a change in the positional relationship between the display unit on which the image is displayed and the user's eyes. In addition, techniques for suppressing the occurrence of such a display phenomenon have been proposed.

For example, as one of the above display phenomena, there is color braking (also referred to as color breakup). Color braking occurs when an image is displayed on a display unit by a field sequential method (hereinafter referred to as “FS method”). In the FS system, red (R), green (G), and blue (B) light is continuously switched to emit light, and the switching speed is faster than the temporal resolution of the human eye. This is a method applied to human recognition of RGB colors mixed. Color braking occurs when RGB images that are sequentially displayed as time elapses do not mix well. When color braking occurs, RGB images are visually recognized as afterimages and the like, and the visibility of the user is reduced. On the other hand, the technique for suppressing the fall of the visibility by color braking is proposed (for example, refer patent document 1).

JP 2003-58113 A

In a head mounted display (hereinafter referred to as “HMD”), a display unit is held on the user's head via an arm unit or the like. For this reason, in the HMD, the positional relationship between the user's eyes and the display unit is easily changed as compared with a general installation type display device. For this reason, in the HMD, there is a problem that display phenomena such as the above-mentioned color braking that reduce the visibility of the user are likely to occur.

An object of the present disclosure is to provide a head mounted display that can suppress a decrease in the visibility of the user in accordance with a change in the positional relationship between the user's eyes and the display unit.

The head-mounted display according to the first aspect of the present disclosure is provided with a display unit having a display element that displays a color image by controlling the output timing of RGB light, and for mounting the display unit on a user's head. A mounting unit including at least an adjustment unit capable of adjusting a position of the display unit with respect to the user's eye, and a position detection unit that detects a positional relationship between the user's eye and the display unit. And a control means for displaying an image on the display element in a display method for outputting RGB light at an output timing corresponding to the positional relationship detected by the position detecting means.

In the head mounted display (HMD), when the positional relationship between the user's eyes and the display unit satisfies a predetermined condition, the positional relationship between the user's eyes and the display unit is easily changed depending on the direction of the line of sight. Is likely to change. Note that when the direction of the line of sight changes, there is a high possibility that a display phenomenon that reduces the visibility of the user will occur. On the other hand, the HMD outputs RGB light from the display element at an output timing at which a display phenomenon that reduces the visibility of the user is unlikely to occur according to the positional relationship between the user's eyes and the display unit. An image is displayed on the element. Thereby, HMD can suppress that a user's visibility falls.

The head-mounted display according to the second aspect of the present disclosure is provided with a display unit having a display element that displays a color image by controlling the output timing of RGB light, and for mounting the display unit on a user's head A mounting unit having an adjustment unit capable of adjusting a position of the display unit with respect to the user's eye, and a position detection unit that detects a positional relationship between the user's eye and the display unit, Control means for causing the display element to display an image in a first method or a second method in which RGB light output timings are different from each other in accordance with the positional relationship detected by the position detection unit; Is a method of switching and outputting RGB light in a first cycle in a time division manner, and the second method switches RGB light in a second cycle shorter than the first cycle in a time division manner. Out Characterized in that it is a method of. According to the 2nd aspect, there can exist an effect similar to Claim 1. In addition, the RGB images displayed by the FS method are reproduced in the same manner even if the image is displayed by the first method or the second method. Accordingly, the HMD can appropriately reproduce the display mode of the original image regardless of whether the image is displayed by the first method or the second method.

It is a perspective view of HMD1. 3 is an enlarged view of a first ball joint 6 and a second ball joint 7. FIG. It is a figure which shows HMD1 of the state by which HD2 is arrange | positioned in the 1st position or the 2nd position. It is a figure which shows HMD1 of the state by which HD2 is arrange | positioned in the 3rd position. It is a block diagram which shows the electric constitution of HMD1. It is a timing chart which shows a field sequential system (A) and another system (B). It is a flowchart of a main process. It is a timing chart which shows the field sequential system (A) in a 1st modification, and another system (B). It is a timing chart which shows the field sequential system (A) and another system (B) in a 2nd modification. It is a figure which shows arrangement | positioning of the camera 39 with respect to HD2.

<Overview of HMD1>
An embodiment of the present disclosure will be described. As shown in FIG. 1, a head mounted display (hereinafter referred to as “HMD”) 1 is a video transmission type HMD. The HMD 1 includes a wearing tool 10, a mounting unit 11, and a display device 2 (hereinafter referred to as “HD2”). Hereinafter, in order to help understand the description of the figure, the upper side, lower side, left side, right side, front side, and rear side of the HMD 1 are defined. The upper side, the lower side, the left side, the right side, the front side, and the rear side of the HMD 1 correspond to, for example, the upper side, the lower side, the upper left side, the lower right side, the left side, and the right side in FIG. The upper side, the lower side, the left side, the right side, the front side, and the rear side of the HMD 1 correspond to the upper side, the lower side, the right side, the left side, the front side, and the rear side, respectively, for the user wearing the wearing tool 10. .

As shown in FIG. 1, the wearing tool 10 is made of a flexible material such as resin or metal (for example, stainless steel). The wearing tool 10 includes a first portion 10A and second portions 10B and 10C. In the following, in order to facilitate understanding, the wearing tool 10 is described as being divided into a first part 10A and a second part 10B, 10C, but the wearing tool 10 is divided into the first part 10A and the second part 10B. It is not divided into each member of 10C, but is an integral member as a whole. *

The first part 10A and the second part 10B, 10C are each curved and elongated plate-like members. The first portion 10 A extends in the left-right direction between the position 102 and the position 103 in the wearing tool 10. The first portion 10A is curved in a convex shape on the front side. The position 102 is located on the left side of the center 101 in the left-right direction of the wearing tool 10. The position 103 is located on the right side of the center 101 in the left-right direction of the wearing tool 10. The second portion 10 B extends rearward from the position 102 in the wearing tool 10. The second portion 10 C extends rearward from the position 103 in the wearing tool 10. The second portions 10B and 10C each extend in a direction in which the rear end portions approach each other. The wearing tool 10 is worn on the user's head with the first part 10A, the second part 10B, and 10C in contact with the frontal, right and left heads of the user, respectively. Is done. The mounting portion 11 is fixed at the position 103 of the wearing tool 10. Hereinafter, the side surrounded by the first portion 10A and the second portions 10B and 10C in the wearing tool 10 is referred to as “inside”, and the side opposite to the inside is referred to as “outside”.

The mounting part 11 includes an arm part 12, a fixing part 14, a first ball joint 6, and a second ball joint 7. The fixing | fixed part 14 is fixed to the position 103 of the wearing tool 10 with the screw | thread 14A (refer FIG. 2 (A)). The arm part 12 is substantially rod-shaped. The arm portion 12 is made of resin, metal, or the like. The arm part 12 extends in the vertical direction as viewed from the front. The upper end portion of the arm portion 12 is connected to the fixed portion 14 via the first ball joint 6. The lower end portion of the arm portion 12 is connected to the HD 2 via the second ball joint 7. The arm part 12 connects the fixing part 14 and the HD 2. The arm portion 12 and the fixing portion 14 can hold the HD 2 on the front side of the user's left eye in a state where the wearing tool 10 is worn on the user's head. The first ball joint 6 and the second ball joint 7 can adjust the position of HD2 with respect to the user's left eye 8 (see FIG. 3 and the like).

As shown in FIG. 2A, the first ball joint 6 includes a ball stud 61 and a socket 62. The ball stud 61 has a rod portion 61A and a sphere portion 61B. The spherical body portion 61B is a spherical portion provided at one end of the rod portion 61A. The socket 62 supports the sphere 61B so as to be slidable. In the following description, the direction orthogonal to the outer peripheral surface 100 of the wearing tool 10 in the position where the fixing | fixed part 14 and the socket 62 are arrange | positioned among the wearing tools 10 is called "orthogonal direction." The socket 62 has a lid portion 621 and a receiving portion 622. The receiving part 622 has a cylindrical shape and extends outward from the fixed part 14 along the orthogonal direction. The spherical portion 61B is accommodated inside the receiving portion 622. The receiving portion 622 has a thread on the outer surface. The lid 621 has a thread on the inner surface. The lid portion 621 is screwed into the receiving portion 622. The lid 621 has a circular hole 621A. The rod portion 61A of the ball stud 61 extends from the inside of the receiving portion 622 toward the hole portion 621A and passes through the hole portion 621A. The rod portion 61A extends outward along the orthogonal direction from the sphere portion 61B, bends rightward, further extends along the left-right direction, and is supported by the arm portion 12. The bending angle θ1 of the rod 61A is about 30 degrees.

When the spherical body part 61B slides with respect to the socket 62, the first ball joint 6 connects the fixing part 14 and the arm part 12 in a rotatable manner. The movable range of the arm portion 12 with respect to the fixed portion 14 is limited by the contact of the rod portion 61A with the hole portion 621A.

2B, the second ball joint 7 includes a ball stud 71 and a socket 72. The ball stud 71 has a rod portion 71A and a sphere portion 71B. The spherical portion 71B is a spherical portion provided at one end of the rod portion 71A. The socket 72 is provided in the HD2. The socket 72 supports the sphere 71B so as to be slidable. The socket 72 has a lid portion 721 and a receiving portion 722. The receiving part 722 is cylindrical and extends from the HD2. The spherical portion 71B is accommodated in the receiving portion 722. The receiving portion 722 has a thread on the outer surface. The lid 721 has a thread on the inner surface. The lid part 721 is screwed into the receiving part 722. The lid 721 has a circular hole 721A. The rod portion 71A of the ball stud 71 extends from the inside of the receiving portion 722 toward the hole portion 721A and passes through the hole portion 721A. The other end portion of the rod portion 71A is supported by the arm portion 12. The rod portion 71A extends from the arm portion 12 toward the left side, bends in a direction away from the wearing tool 10, and further extends, and is supported by the HD 2 via the sphere portion 71B and the socket 62. The bending angle θ2 of the rod portion 71A is about 30 degrees.

As the spherical portion 71B slides on the socket 72, the second ball joint 7 connects the HD 2 and the arm portion 12 in a rotatable manner. The movable range of HD2 with respect to the arm portion 12 is limited by the rod portion 71A coming into contact with the hole portion 721A.

As shown in FIG. 1, the HD 2 includes a housing 21. The casing 21 has a hollow box shape. A rectangular opening is provided at the rear end of the housing 21. The opening is covered with a transparent plate member. The liquid crystal panel 2 A is accommodated in the housing 21. The liquid crystal panel 2A displays a color image by controlling the output timing of each of red (R), green (G), and blue (B) light. The liquid crystal panel 2A can display an image in one of two display methods (field sequential method (hereinafter referred to as “FS method”) or another method) in which the output timings of RGB light are different from each other. . The liquid crystal panel 2A is electrically connected to the external device 9 (see FIG. 5) via the cable 2B. The external device 9 is a control box that performs control for displaying an image on the liquid crystal panel 2A, for example. The liquid crystal panel 2A displays an image on the display surface based on the image signal received from the external device 9 via the cable 2B. The light of the image displayed on the display surface of the liquid crystal panel 2 A is emitted toward the opening of the housing 21. The light of the image passes through the opening of the housing 21 and further passes through the transparent plate member to the rear side. The image light is emitted from the housing 21 to the outside. Hereinafter, as shown in FIG. 2B, the display surface of the liquid crystal panel 2A, in other words, the portion of the liquid crystal panel 2A from which the image light is emitted is referred to as an “emission portion 22”.

<How to use HMD1>
A user fixes the wearing tool 10 of HMD1 to a head. The user holds the HD 2, and as shown in FIG. 3A, the HD 2 is arranged so that any position of the light emitting portion 22 of the liquid crystal panel 2 A is disposed to face the front side of the left eye 8 of the user. Adjust the position. At this time, since the first ball joint 6 and the second ball joint 7 freely rotate, the user can easily move the HD 2. Hereinafter, a region including HD2 in a case where any position of the emission unit 22 faces the front side of the user's left eye 8 is referred to as a “central region”.

Among the fixed portions 14, a center C11 of a sphere portion 61B (see FIG. 2A) of the first ball joint 6 is defined. The center C12 of the emission part 22 of HD2 is defined. The position of HD2 when the center C12 of the emitting portion 22 faces the front side of the user's left eye 8 (see FIG. 3A) is referred to as a “first position”. The first position is included in the first region. The distance between the centers C11 and C12 when the HD2 is disposed at the first position is referred to as a “first distance L1”.

A signal is output from the external device 9 (see FIG. 5) to the liquid crystal panel 2A of the HD 2 via the cable 2B (see FIG. 1). An image is displayed on the emission part 22 of the liquid crystal panel 2A. The light of the displayed image is emitted to the rear side through the opening of the housing 21. When the HD 2 is arranged in the central area, the emitted image light enters the left eye 8 of the user. Thereby, the user recognizes the image.

The user may arrange and use the HD2 so that both the image displayed on the liquid crystal panel 2A of the HD2 and the scenery in front of the user can be visually recognized. In this case, the user rotates the second ball joint 7 from the state in which the HD 2 is disposed at the first position (see FIG. 3A) clockwise by the first predetermined angle or more in a state viewed from above. (See FIG. 3B). That is, the user can adjust the second ball joint 7 so that the rotation angle about the vertical direction of the second ball joint 7 is larger than the rotation angle about the vertical direction of the first ball joint 6. Rotate. As a result, the user moves the HD 2 until the emission part 22 is not disposed opposite to the front side of the left eye 8. As shown in FIG. 3B, the HD 2 moves in a direction away from the wearing tool 10. The distance between the centers C11 and C12 changes to a second distance L2 that is longer than the first distance L1.

Hereinafter, the position of HD2 when the second ball joint 7 is moved by rotating the second ball joint 7 by a first predetermined angle or more is referred to as a “second position”. When HD2 is disposed at the second position, the distance between the centers C11 and C12 is the second distance L2. Of the areas other than the central area, a predetermined area including HD2 arranged at the second position is referred to as a “first peripheral area”. When the HD2 is disposed at the second position, the user can visually recognize the scenery in front of the eyes by directing the line of sight toward the front side. Further, the user can visually recognize the image displayed on the emission unit 22 of the liquid crystal panel 2A by shifting the direction of the line of sight to the right side of the HMD 1 (left side as viewed from the user).

2B, the rod portion 71A of the ball stud 71 of the second ball joint 7 extends from the arm portion 12, bends away from the wearing tool 10, and is supported by the socket 72. Connected to the spherical portion 71B. For this reason, as for the position of HD2, the movable range of HD2 in the direction away from the face becomes wider and the movable range of HD2 in the direction approaching the face becomes narrower than in the case where the rod portion 71A is not bent. Therefore, the user can easily move the HD 2 in the direction away from the face and place it at the second position.

The user may use the HD2 by placing it out of the field of view so that the scenery in front of him can be seen well. In this case, the user rotates the first ball joint 6 more than the second predetermined angle clockwise from the state in which the HD 2 is disposed at the first position (see FIG. 3A) as viewed from the right side. (See FIG. 4). That is, the user can adjust the first ball joint 6 so that the rotation angle about the left and right direction of the first ball joint 6 is larger than the rotation angle about the left and right direction of the first ball joint 6. Rotate. Accordingly, as shown in FIG. 4, the user moves the HD 2 until the emitting portion 22 is not disposed to face the front side of the left eye 8. The distance between the centers C11 and C12 is maintained at a third distance L3 that is substantially the same as the first distance L1.

Hereinafter, the position of HD2 when the first ball joint 6 is moved by rotating the first ball joint 6 by a second predetermined angle or more is referred to as a “third position”. When HD2 is arranged at the third position, the distance between the centers C11 and C12 is the third distance L3. Of the central region and the region excluding the first peripheral region, a predetermined region including HD2 arranged at the third position is referred to as a “second peripheral region”. When HD2 is arrange | positioned in the 3rd position, the user can visually recognize the scenery in front of the eyes while suppressing HD2 from entering the field of view.

As shown in FIG. 2A, the rod portion 61A of the ball stud 61 of the first ball joint 6 extends from the spherical portion 61B along the orthogonal direction, bends rightward, and extends along the left-right direction. , Supported by the arm portion 12. That is, the extending direction (left-right direction) of a part of the rod portion 61A coincides with the axial direction (left-right direction) when the first ball joint 6 rotates. For this reason, the first ball joint 6 is easier to rotate around the left-right direction as compared to the case where the rod portion 61A is not bent. Therefore, the user can easily move the HD 2 from the first position to the third position by rotating the first ball joint 6.

<Electrical configuration of HMD1>
With reference to FIG. 5, the electrical structure of the wearing tool 10 and HMD1 is demonstrated. The wearing tool 10 includes an acceleration sensor 41. The acceleration sensor 41 is electrically connected to the HD2 FPGA 33 (described later). The acceleration sensor 41 detects respective accelerations in the three-axis directions (X-axis direction, Y-axis direction, and Z-axis direction) that act on the wearing tool 10. The acceleration sensor 41 outputs a signal indicating the detected acceleration to the FPGA 33.

The HD 2 includes a CPU 31, a storage unit 32, a liquid crystal panel 2 A, FPGAs 33 to 36,

acceleration sensors

37 and 38, and a camera 39. The CPU 31 controls the entire HMD 1. The storage unit 32, the liquid crystal panel 2A, the

FPGAs

33, 34, and 36, and the acceleration sensor 38 are electrically connected to the CPU 31. The acceleration sensor 37 is electrically connected to the FPGA 33. The camera 39 is electrically connected to the FPGA 34. The FPGA 35 is electrically connected to the FPGA 36. The storage unit 32 stores a program for main processing (see FIG. 7) executed by the CPU 31, various parameters, and the like. The HMD 1 may have one FPGA having all the functions of the FPGAs 33 to 36 instead of the FPGAs 33 to 36.

Acceleration sensor 37 detects the respective accelerations in the three-axis directions that act on HD2. The acceleration sensor 37 outputs a signal indicating the detected acceleration to the FPGA 33. The FPGA 33 is a programmable logic device (PLD) having a function of detecting the position of the HD 2 with respect to the wearing tool 10. The FPGA 33 specifies acceleration acting on the HD 2 based on the signal output from the acceleration sensor 37. The FPGA 33 specifies the acceleration acting on the wearing tool 10 based on the signal output from the acceleration sensor 41. FPGA33 detects the position of HD2 with respect to the wearing tool 10 by calculating the difference of each acceleration. Since the wearing tool 10 is worn on the user's head, the position of HD2 with respect to the wearing tool 10 corresponds to the position of HD2 with respect to the user's head. The FPGA 33 outputs a signal indicating the position of the detected HD 2 to the CPU 31.

The camera 39 is provided in the HD2 casing 21 (see FIG. 1), and can photograph the rear side of the casing 21. The camera 39 outputs image data of the captured image to the FPGA 34. The FPGA 34 is a PLD having a function of detecting the direction of the user's line of sight. The method for specifying the direction of the line of sight by the FPGA 34 is as follows. The FPGA 34 specifies the eye of the user's eye as a reference point and specifies the iris of the user's eye as a moving point from the image based on the image data output from the camera 39. The FPGA 34 specifies the direction of the user's line of sight from the iris position with respect to the specified position of the eye. The FPGA 34 outputs a signal indicating the detected line-of-sight direction to the CPU 31.

The acceleration sensor 38 detects the respective accelerations in the three-axis directions acting on the HD 2, similarly to the acceleration sensor 37. The acceleration sensor 38 outputs a signal indicating the detected acceleration to the CPU 31.

The FPGA 35 is a PLD having a function of analyzing pixel colors. The FPGA 35 detects the image signal transmitted from the external device 9 via the cable 2B. The FPGA 35 analyzes each color of a plurality of pixels constituting the image based on the detected signal. The FPGA 35 outputs a signal indicating the analysis result to the FPGA 36. The FPGA 36 is a PLD having a function of detecting a ratio of a specific color area in the entire area of the image. Based on the signal output from the FPGA 35, the FPGA 36 detects the ratio of the black area in the entire area of the image displayed on the liquid crystal panel 2A. The FPGA 36 outputs a signal indicating the detected ratio to the CPU 31.

The liquid crystal panel 2A switches the display method to one of two methods (FS method or another method) based on a signal output from the CPU 31. The liquid crystal panel 2 A causes the emission unit 22 to display an image using a display method according to the signal output from the CPU 31 based on the image signal output from the external device 9.

<Display method (FS method and other methods)>
With reference to FIG. 6, two display methods that can be displayed on the liquid crystal panel 2A of HD2 will be described. The first display method that can be displayed on the HD2 liquid crystal panel 2A is the FS method. The FS method is a method that allows a user to visually recognize a color image by switching and outputting red (R), green (G), and blue (B) light in a time-sharing manner. FIG. 6A illustrates a timing chart of a vertical synchronization signal (Vsync) and output signals of R, G, and B light when a white image is displayed on the liquid crystal panel 2A by the FS method. . As described above, in the FS system, the R, G, and B lights are output in synchronization with the vertical synchronization signal (Vsync) while being switched in the first period T1. The R, G, and B lights are arranged at different times so as to be output at different timings. The light output time at each timing is t1.

The second display method that can be displayed on the HD2 liquid crystal panel 2A is a different method. Another method is a method in which the user visually recognizes an image by outputting any of R, G, and B light output by the FS method at the same timing as the FS method. 6B shows the vertical synchronization signal (Vsync) and R, G, B when the FS method of FIG. 6A is switched to another method that outputs only green (G) light. The timing chart of the output signal of each of these is illustrated. As described above, in another system, any of the R, G, and B lights (B light in the case of FIG. 6B) is output in the first period T1. In this case, the white image in the FS method (FIG. 6A) is converted into a monochrome (green) image by switching to another method. The light output time t1 at each timing is the same as in the FS method.

<Main processing>
The main process executed by the CPU 31 will be described with reference to FIG. The main process is started when the CPU 31 executes the program stored in the storage unit 32 when the output of the image signal is started from the external device 9. As shown in FIG. 7, the CPU 31 outputs a signal for displaying an image by the FS method to the liquid crystal panel 2A (S11). The liquid crystal panel 2 A displays an image on the emission unit 22 by the FS method based on the signal output from the external device 9.

CPU31 specifies the position of HD2 with respect to the wearing tool 10 based on the signal output from FPGA33 (S13). The CPU 31 determines whether the HD2 is arranged in any position in the central area (see FIG. 3A) based on the specified position of the HD2 (S15). When it is determined that the HD 2 is disposed at any position in the central area (S15: YES), the CPU 31 advances the process to S17. Details of the processing of S17 will be described later.

If the CPU 31 determines that HD2 is not arranged at any position in the central area (S15: NO), the HD2 is arranged at any position in the first peripheral area (see FIG. 3B). (S19). When it is determined that the HD 2 is disposed at any position in the first peripheral area (S19: YES), the CPU 31 advances the process to S21. Details of the processing of S21 will be described later. On the other hand, if the CPU 31 determines that HD2 is not arranged at any position in the first peripheral area (S19: NO), HD2 is arranged at any position in the second peripheral area (see FIG. 4). It is determined that The CPU 31 advances the process to S31. Details of the processing of S31 will be described later.

The CPU 31 specifies the direction of the user's line of sight based on the signal output from the FPGA 34 (S21). CPU31 counts the frequency | count when the direction of the eyes | visual_axis identified by the process of S21 changes more than predetermined. The CPU 31 further specifies the number of times per unit time (for example, 1 second) as the change frequency (S23). The CPU 31 determines whether the specified change frequency is less than a predetermined frequency (S25). CPU31 advances a process to S27, when it determines with change frequency being less than predetermined frequency (S25: YES). Details of the processing of S27 will be described later. On the other hand, when it is determined that the change frequency is equal to or higher than the predetermined frequency (S25: NO), the CPU 31 advances the process to S31.

CPU31 specifies the ratio of the black area | region among all the areas | regions of the image displayed on liquid crystal panel 2A based on the signal output from FPGA36 (S27). The CPU 31 determines whether the specified ratio is less than a predetermined threshold (S29). CPU31 advances a process to S17, when it determines with the ratio of a black area | region being less than a predetermined threshold value (S29: YES). On the other hand, if the CPU 31 determines that the ratio of the black area is equal to or greater than the predetermined threshold (S29: NO), the CPU 31 advances the process to S31.

CPU31 outputs the signal for displaying an image by FS method to liquid crystal panel 2A, when performing the process of S17 (S17). The liquid crystal panel 2 A displays an image on the emission unit 22 by the FS method based on the signal output from the external device 9. CPU31 returns a process to S13. When executing the process of S31, the CPU 31 outputs a signal for displaying an image by another method to the liquid crystal panel 2A (S31). The liquid crystal panel 2 A causes the emission unit 22 to display an image by another method based on the signal output from the external device 9. CPU31 returns a process to S13.

<Main effects of this embodiment> In HMD1, the frequency with which the direction of the user's line of sight changes changes according to the positional relationship of HD2 with respect to the user's eyes. Specifically, for example, when the HD2 is arranged at any position in the central area (see FIG. 3A), the user is likely to be viewing the HD2 image. The frequency of change is relatively small. On the other hand, when HD2 is arranged at any position in the first peripheral area (see FIG. 3B), the user is likely to see both the HD2 image and the scenery in front of him. The frequency of change in the direction of the line of sight becomes relatively large. Here, when the direction of the line of sight of the user changes, there is a high possibility that color braking that reduces the visibility of the user will occur.

On the other hand, the CPU 31 of the HMD 1 switches the display method for displaying an image on the liquid crystal panel 2A according to the positional relationship between the HD 2 and the user's eyes. Specifically, the CPU 31 displays an image on the liquid crystal panel 2A by another method when there is a high possibility of color braking. In another method, RGB light is output from the liquid crystal panel 2A at an output timing at which color braking is unlikely to occur. Thereby, HMD1 can suppress that color braking generate | occur | produces based on the change of a user's gaze direction, and a user's visibility falls.

The FPGA 33 detects the position of the HD 2 with respect to the wearing tool 10 worn on the user's head based on signals output from the

acceleration sensors

37 and 41. Thereby, the FPGA 33 can specify the position of HD2 with respect to the left eye 8 of the user. The CPU 31 determines whether or not color braking is likely to occur based on the position of the HD 2 with respect to the user's left eye 8. When there is a high possibility that color braking will occur, the HMD displays an image on the liquid crystal panel 2A by another method in which color braking is difficult to occur (S31). When there is a high possibility that the visibility of the user is reduced, RGB light is output from the liquid crystal panel 2A at an output timing at which a display phenomenon that reduces the visibility of the user is unlikely to occur, and an image is displayed on the liquid crystal panel 2A. Thereby, HMD1 can suppress that color braking generate | occur | produces and a user's visibility falls based on the position of HD2 with respect to a user's left eye 8. FIG.

When the HD2 is disposed at any position in the central region (S15: YES), any position of the emitting portion 22 is disposed opposite to the front side of the user's left eye 8. In this case, the user has a high possibility of visually recognizing the image displayed on the emission unit 22. For this reason, it is assumed that the frequency of changes in the direction of the line of sight of the user is small and the direction of the line of sight is stable. That is, the HMD 1 is in a state where color braking is difficult to occur. In this case, the CPU 31 displays an image on the liquid crystal panel 2A by the FS method (S17). Note that the FS method can increase the resolution of the displayed image as compared to another method. For this reason, the HMD 1 can display an image with better image quality on the liquid crystal panel 2A in a state where the possibility of color braking is low. On the other hand, when the display unit is arranged at any position in the first peripheral area (S15: NO), the user can visually recognize both the image displayed on the liquid crystal panel 2A and the scenery in front of him. There is a high possibility that the direction of the line of sight is frequently changed. In other words, color braking is likely to occur. In this case, the CPU 31 displays an image on the liquid crystal panel 2A by another method (S31). Thereby, since HMD1 can suppress generation | occurrence | production of color braking, it can suppress that a user's visibility falls. In this way, the HMD 1 can determine the ease of occurrence of color braking according to the position of the HD 2, and can display an image on the liquid crystal panel 2 A by another method when color braking is likely to occur.

The HMD 1 arranges the HD 2 in any one of the first position, the second position, and the third position by rotating at least one of the first ball joint 6 and the second ball joint 7. Here, the second distance L2 when HD2 is arranged at the second position (FIG. 3B) than the first distance L1 when HD2 is arranged at the first position (see FIG. 3A). See) is longer. For this reason, the CPU 31 determines whether the HD2 is disposed in the central region including the first position or the HD2 is disposed in the first peripheral region including the second position. This can be determined based on the distance to the unit 22. In other words, the HMD 1 outputs whether the HD2 is arranged at any position in the central area including the first position or the HD2 is arranged at any position in the peripheral area including the second position. It can be specified depending on whether the distance between the portion 22 and the spherical portion 61B of the first ball joint 6 is the first distance L1 or the second distance L2. That is, the CPU 31 determines the ease of occurrence of color braking based on the distance between the spherical portion 61B of the first ball joint 6 and the emitting portion 22, and displays an appropriate display method (FS method) according to the position of HD2. Alternatively, an image can be displayed on the liquid crystal panel 2A by another method.

On the other hand, the HD 2 is disposed at the third position by rotating the first ball joint 6 by a second predetermined angle or more from the state disposed at the first position (see FIG. 3A) (FIG. 4). reference). At this time, the rotation angle of the first ball joint 6 is larger than the rotation angle of the second ball joint 7. Therefore, the CPU 31 determines whether the HD2 is disposed in the central region including the first position or the HD2 is disposed in the second peripheral region including the third position. Can be determined based on That is, the CPU 31 determines the ease of occurrence of color braking according to the angle between the fixed portion 14 and the arm portion 12, and displays an image on the liquid crystal panel 2A by an appropriate display method (FS method or another method). Can be made.

The user may place the HD2 in the second peripheral region in order to view the scenery in front of the eyes well by removing the HD2 from the field of view. In this case, since the user does not visually recognize the image displayed on the emission unit 22 of the liquid crystal panel 2A, color braking does not occur in the HMD1. However, for example, when the user moves the HD 2 arranged at any position in the second peripheral area to the central area including the original first position, an image is displayed on the liquid crystal panel 2A by the FS method. Color braking may occur immediately after the movement. Therefore, when the CPU 31 determines that the HD 2 is disposed in the second peripheral area (S19: NO), the CPU 31 displays an image on the liquid crystal panel 2A by another method (S31). As a result, the HMD 1 causes color braking when the HD 2 moves from any position (for example, the third position) in the second peripheral area to any position (for example, the first position) in the central area. This can be suppressed. *

The CPU 31 specifies the change frequency based on the number of times when the direction of the line of sight changes more than a predetermined value (S23). When the change frequency is less than the predetermined frequency (S25: YES), color braking is unlikely to occur even when an image is displayed on the liquid crystal panel 2A by the FS method. Therefore, in such a case, the CPU 31 displays an image on the liquid crystal panel 2A by the FS method (S17). In the present embodiment, if the change frequency is less than the predetermined frequency (S25: YES), the process proceeds to S27, and if the CPU 31 determines that the ratio of the black area is less than the predetermined threshold (S29: YES), the process To S17. As a result, the HMD 1 can perform display control utilizing the features of the FS method when color braking is difficult to occur. On the other hand, as the change frequency increases, color braking is more likely to occur when an image is displayed on the liquid crystal panel 2A by the FS method. For this reason, when the change frequency is equal to or higher than the predetermined frequency (S25: NO), the CPU 31 displays an image on the liquid crystal panel 2A by another method (S31). As a result, the HMD 1 determines a change in the direction of the user's line of sight, and in the present embodiment, the occurrence of color braking can be further suppressed by specifying the frequency, thereby reducing the visibility of the user. Can be suppressed. Note that the FPGA 34 specifies the direction of the line of sight of the user based on the image data output from the camera 39, so that the change in the direction of the line of sight can be specified easily and appropriately.

When an image is displayed by the FS method, color braking is more likely to occur, particularly as the image approximates a black and white image. Further, the larger the ratio of the black area to the entire area of the image, the closer the image is to a black and white image. On the other hand, in HMD1, when the black ratio is equal to or greater than the predetermined threshold (S29: NO), an image is displayed on the liquid crystal panel 2A by another method (S31). As a result, an image is displayed in a different manner in a state where color braking is likely to occur, so the HMD 1 can effectively suppress color braking.

The FS system is a system that allows a user to visually recognize a color image by switching and outputting R, G, and B light in a time-sharing manner. On the other hand, another method is a method for allowing a user to visually recognize a monochromatic image by outputting any one of R, G, and B light output by the FS method at the same timing as the FS method. Note that color braking occurs when an image of each RGB color is visually recognized as an afterimage or the like. For this reason, the HMD 1 displays the image on the liquid crystal panel 2 A by another method so that the user can visually recognize the monochromatic image, so that the occurrence of color braking can be suppressed. Further, the HMD 1 can suppress the total output amount of light by displaying an image on the liquid crystal panel 2A by another method. Therefore, the HMD 1 can suppress power consumption by displaying an image on the liquid crystal panel 2A by another method, as compared with the case of displaying an image on the liquid crystal panel 2A by the FS method.

<First Modification>
Another method in the above embodiment can be changed to another method. As shown in FIG. 8, another method in the first modification is a method in which the user visually recognizes an image by outputting all of R, G, and B light at the same timing. FIG. 8B is a timing chart of the vertical sync signal (Vsync) and the output signals of the R, G, and B lights when the FS method of FIG. 8A is switched to another method. Illustrate. Thus, in another system in the first modification, all the R, G, and B lights are output in synchronization with the first period T1. In this case, all images other than white (for example, R, G, and B colors) in the FS method of FIG. 8A are all converted to white images by switching to another method. The light output time t1 at each timing is the same as in the FS method.

The HMD 1 can suppress the occurrence of color braking by displaying an image on the liquid crystal panel 2A by another method. This is because color braking occurs because light of each color of RGB is output at different timing, whereas light of each color of RGB is output at the same timing in another method. Further, when an image is displayed on the liquid crystal panel 2A by another method, all the RGB color images in the FS method are displayed as white images. That is, the original color image is converted into a monochrome image by switching the FS method to another method. On the other hand, in the above embodiment, an image in the FS system is converted into a single color image (see FIG. 6). Therefore, the HMD 1 can display an image on the liquid crystal panel 2 A while maintaining the display mode of the original image as much as possible as compared with the case of another method in the embodiment.

<Second Modification>
As shown in FIG. 9, another method in the second modified example is that the R, G, B light is output while being switched in a second period T2 that is half of the first period T1. This is a method for visually recognizing an image. FIG. 9B is a timing chart of the vertical sync signal (Vsync) and the output signals of the R, G, and B lights when the FS method of FIG. 9A is switched to another method. Illustrate. The lights of R, G, and B are arranged at different times so as to be output at different timings as in the FS system. In another method, the light output time t2 is ½ of the FS output time t1. That is, in another method, the output frequency of light of each RGB color is twice that of the FS method (first cycle T1 → second cycle T2), and the output time of each light is ½ that of the FS method (output time). t1 → output time t2). For this reason, the total output time of light of each RGB color is the same as in the FS method.

The HMD 1 can suppress the occurrence of color braking by displaying an image on the liquid crystal panel 2A by another method. This is because color braking is caused by the fact that RGB color images do not mix well when viewed by the user, but by using a different method, the second period T2 is shorter than that of the FS method. This is because light of each color of RGB is output while being switched, and thus there is a high possibility that they will be appropriately mixed by the afterimage effect. Furthermore, RGB images in the FS format are reproduced in the same manner even in images displayed in a different format. Accordingly, the HMD 1 can appropriately reproduce the display mode of the original image even when the image is displayed on the liquid crystal panel 2A by another method.

<Other variations>
The present disclosure is not limited to the above-described embodiment, and various modifications can be made. The HMD 1 has a configuration in which the HD 2 is disposed in front of the user's left eye 8. However, the HD 2 may be disposed in front of the user's right eye. The CPU 31 may display an image on the liquid crystal panel 2 A by another display method that is different from the FS method and has a low possibility of occurrence of color braking by the process of S 17. Based on the position of HD2 specified based on the signal output from the FPGA 33 and the position of the iris of the user's eye specified by the FPGA 34, the CPU 31 determines the relative relationship between the left eye 8 of the user and HD2. The positional relationship may be specified. As a result, the CPU 31 can specify the relative position of the HD2 with respect to the left eye 8 of the user more accurately than when the position of the HD2 is specified based only on the signal output from the FPGA 33.

The HMD 1 may photograph the wearing tool 10 with the camera 39. The CPU 31 may specify the position of the HD 2 based on the captured image data. Further, the HMD 1 may photograph the first ball joint 6 with the camera 39. The CPU 31 may specify the distance between the centers C11 and C12 based on the captured image data. The CPU 31 may specify the position of HD2 based on the specified distance. The HMD 1 may include a sensor that detects the rotation angles of the first ball joint 6 and the second ball joint 7. The CPU 31 may specify the position of the HD 2 based on the rotation angles of the first ball joint 6 and the second ball joint 7 specified based on this sensor.

HMD 1 may not have the wearing tool 10. The fixing portion 14 may be fixed to another member different from the wearing tool 10. For example, the fixing portion 14 may be fixed to a hat, a helmet, or the like worn by the user. The first distance L1 when HD2 is disposed at the first position may be longer than the second distance L2 when HD2 is disposed at the second position. The rotation angle of the first ball joint 6 when moving the HD 2 from the first position to the third position may be smaller than the rotation angle of the second ball joint 7. The mounting portion 11 may have another adjustment mechanism, for example, a flexible joint formed of an elastic body such as rubber, instead of the first ball joint 6 and the second ball joint 7.

The HMD 1 may specify the direction of the user's line of sight by another method. For example, the HMD 1 may have a light source and a camera capable of infrared imaging when the user's face is illuminated with infrared rays. The CPU 31 may detect corneal reflection from infrared reflected light photographed by the camera. The CPU 31 may specify the position of the pupil with respect to the detected position of corneal reflection. The CPU 31 may specify the direction of the line of sight based on the specified pupil position.

The FPGA 34 may output a signal indicating the position of the user's eyes to the CPU 31 instead of a signal indicating the direction of the line of sight. The CPU 31 may specify the position of the user's eye based on the signal output from the FPGA 34. CPU31 may count the frequency | count when the position of the specified eye changes more than predetermined. The CPU 31 may further specify the number of times per unit time (for example, 1 second) as the change frequency (S23).

The FPGA 36 may detect whether the image is a black and white image or a color image based on a signal output from the FPGA 35, and may output a signal indicating the detection result to the CPU 31. When the CPU 31 determines that the image is a color image based on the signal output from the FPGA 36, the CPU 31 may cause the liquid crystal panel 2A to display the image using the FS method (S17). On the other hand, when it is determined that the image is a black and white image, the CPU 31 may cause the liquid crystal panel 2A to display the image by another method (S31).

When it is determined that the HD 2 is arranged at the first peripheral position or the second peripheral position (S19: YES, S19: NO), the CPU 31 determines whether the liquid crystal panel 2A is used regardless of the line-of-sight direction and the ratio of the black area. Alternatively, the image may be displayed by another method (S31). When it is determined that the line-of-sight change frequency is less than the predetermined frequency (S25: YES), the CPU 31 may display an image on the liquid crystal panel 2A by the FS method regardless of the position of the HD2 or the ratio of the black region ( S17).

The position and quantity of the camera 39 provided in the HD2 casing 21 for photographing the user's left eye 8 are not particularly limited. For example, as shown in FIG. 10A, a camera 39A may be provided at the left end of the opening at the rear end of the housing 21 of the HD2, or a camera 39B may be provided at the right end. Both

cameras

39A and 39B may be provided. Note that when the camera 39 is provided in the HD 2, the shooting range can be easily directed to the user side. Therefore, the HMD 1 can appropriately photograph the user's left eye 8 with the camera 39. Moreover, since the wearing tool 10 of HMD1 is mounted | worn with a head, there exists a tendency for size reduction to be desired. For this reason, the pace which fixes the camera 39 may not be ensured enough for the wearing tool 10. FIG. Even in such a case, the camera 39 can be stably held by providing the camera 39 in the HD 2.

Furthermore, the camera 39A may photograph the eye on the side separated from the HD2 among the both eyes of the user, that is, the right eye. The FPGA 34 may specify the position of the right eye or the direction of the line of sight of the right eye. In addition, since the movement of the eyes is interlocked with both eyes, the direction of the line of sight of the eye on the side separated from HD2 coincides with the direction of the line of sight of the eye on the side close to HD2. Therefore, as described above, even when processing similar to that in the above embodiment is performed based on the direction of the line of sight of the right eye, the HMD 1 controls the display method based on the change in the position of the left eye 8 of the user. It can be carried out. In addition, since the HMD 1 is mounted on the head, there is a tendency that it is desired to reduce the size, and there may be a case where sufficient space for newly installing a detection device cannot be secured on the side of the HMD 1 where the HD 2 is disposed. is there. Even in such a case, the HMD 1 uses the fact that the movement of the user's eye is interlocked with both eyes and arranges the detection device on the side where the HD 2 is not arranged. The display method can be controlled in accordance with a change in the direction of the user's line of sight.

Further, as shown in FIG. 10B, a half mirror 391 may be provided on the rear side of the liquid crystal panel 2A in the inside of the housing 21 of the HD2. The half mirror 391 may reflect the external light incident from the opening at the rear end of the housing 21 to the right side. On the right side of the half mirror 391, a camera 39C capable of photographing the outside world based on the light reflected by the half mirror 391 may be provided. The CPU 31 may specify the direction of the line of sight of the user's left eye 8 based on the data of the image captured by the camera 39C. With this configuration, it is possible to improve the accuracy of the specified line-of-sight direction as compared with the case of FIG.

Furthermore, the camera 39 may be provided in any of the wearing tool 10 and the mounting part 11 (fixing part 14, arm part 12, etc.). When the camera 39 is attached to the wearing tool 10, the direction of the line of sight of the right eye may be specified by photographing the right eye of the user. In addition, when the camera 39 is provided in the wearing tool 10, it can suppress that the weight of the camera 39 is weighted to HD2. Therefore, the HMD 1 can suppress a decrease in wearability due to an increase in the weight of the HD 2.

<Others>
HD2 is an example of the “display unit” of the present disclosure. The liquid crystal panel 2A is an example of the “display element” of the present disclosure. The first ball joint 6 and the second ball joint 7 are examples of the “adjustment unit” of the present disclosure. The

FPGAs

33 and 34 are examples of the “position detection unit” of the present disclosure. The CPU 31 that performs the processes of S17 and S31 is an example of the “control unit” of the present disclosure. The CPU 31 that performs the process of S17 is an example of the “first control unit” of the present disclosure. The CPU 31 that performs the process of S31 is an example of the “second control unit” of the present disclosure. The first ball joint 6 is an example of the “first adjustment unit” in the present disclosure. The second ball joint 7 is an example of the “second adjustment unit” in the present disclosure. The FPGA 33 is an example of the “first position detection unit” of the present disclosure. The FPGA 34 is an example of the “second position detection unit” of the present disclosure. The camera 39 is an example of the “imaging unit” of the present disclosure. The FPGA 36 is an example of the “ratio detection unit” of the present disclosure. The first peripheral region and the second peripheral region are examples of the “peripheral region” of the present disclosure.

1: HMD
2: HD
2A: Liquid crystal panel 6: First ball joint 7: Second ball joint 8: Left eye 10: Wearing tool 11: Wearing part 12: Arm part 14: Fixing part 22: Emitting part 31: CPU
33, 34, 35, 36: FPGA
37, 38, 41: Acceleration sensor 39: Camera

Claims

A display unit having a display element for displaying a color image by controlling the output timing of RGB light;
A member for mounting the display unit on a user's head, the mounting unit including at least an adjustment unit capable of adjusting the position of the display unit with respect to the user's eyes;
Position detecting means for detecting a positional relationship between the user's eye and the display unit;
A head-mounted display, comprising: a control unit that displays an image on the display element in a display method in which RGB light is output at an output timing corresponding to the positional relationship detected by the position detection unit.
The position detection means includes first position detection means for detecting the position of the display unit,
The control means causes the display element to display the image by a display method in which RGB light is output at an output timing corresponding to the position of the display unit detected by the first position detection means. The head mounted display according to claim 1.
The adjustment unit excludes a central region including a position of the display unit when an emission unit from which light of the image displayed on the display element is emitted faces the user's eyes, and the central region The position of the display unit can be adjusted to any one of the peripheral areas,
The control means includes
First control means for displaying the image on the display element in a field sequential manner when the position of the display unit detected by the first position detection means is included in the central region;
When the position of the display unit detected by the first position detection unit is included in the peripheral region, the display unit includes a second control unit that displays the image on the display element in a different method from the field sequential method. The head mounted display according to claim 2.
The mounting part has a fixing part fixed to a wearing tool worn on the user's head, and an arm part that connects the fixing part and the display part,
The adjustment unit is
A first adjustment unit that rotatably connects the fixing unit and the arm unit; and a second adjustment unit that rotatably connects the display unit and the arm unit;
By rotating at least one of the first adjustment unit and the second adjustment unit, the display unit is at a position where the distance between the emission unit and the first adjustment unit is a first distance, and A second position included in the peripheral area, which is a position where a distance between the first position included in the central area and the distance between the emitting portion and the first adjusting section is a second distance longer than the first distance. And can be adjusted
When the position of the display unit detected by the first position detection unit is included in the central region including the first position, the first control unit displays the image on the display element by the field sequential method. Display
When the position of the display unit detected by the first position detection unit is included in the peripheral region including the second position, the second control unit may perform the display element in a different method from the field sequential method. The head-mounted display according to claim 3, wherein the image is displayed on the head.
The mounting part has a fixing part fixed to a wearing tool worn on the user's head, and an arm part that connects the fixing part and the display part,
The adjustment unit is
A first adjustment unit that rotatably connects the fixing unit and the arm unit; and a second adjustment unit that rotatably connects the display unit and the arm unit;
By rotating at least one of the first adjustment unit and the second adjustment unit, the display unit is moved from a first position included in the central region, and the display unit is arranged in the first position. The first adjustment unit can be adjusted to a position when the first adjustment unit is rotated by a predetermined angle or more larger than the second adjustment unit and to a third position included in the peripheral region,
When the position of the display unit detected by the first position detection unit is included in the central region including the first position, the first control unit displays the image on the display element by the field sequential method. Display
When the position of the display unit detected by the first position detection unit is included in the peripheral region including the third position, the second control unit may perform the display element in a different method from the field sequential method. The head-mounted display according to claim 3, wherein the image is displayed on the head.
The position detection means includes second position detection means for detecting the direction of the line of sight based on the position of the eyes of the user,
The control means causes the display element to display the image in a display system that outputs RGB light at an output timing corresponding to a change in the direction of the line of sight detected by the second position detection means. The head mounted display according to claim 1.
The control means includes
First control means for displaying the image on the display element in a field sequential manner when the frequency of change in the direction of the line of sight detected by the second position detection means is less than a predetermined frequency;
When the frequency of the change in the direction of the line of sight detected by the second position detection unit is equal to or higher than the predetermined frequency, the display element displays the image in a different method different from the field sequential method. The head-mounted display according to claim 6, further comprising: 2 control means.
The head mounted display according to claim 6 or 7, wherein the second position detecting means detects a change in a position of an eye on a side separated from the display unit among the eyes of the user.
The camera further includes a photographing unit that photographs the eyes of the user,
The second position detecting means includes
The head mounted display according to any one of claims 6 to 8, wherein a direction of the line of sight is specified based on image data of the user's eyes photographed by the photographing unit.
Comprising a ratio detection means for detecting a ratio of a black area of the entire area of the image displayed on the display element;
The first control means includes
When the ratio detected by the ratio detection unit is less than a predetermined threshold, the second control unit displays the image on the display element by the field sequential method.
10. The head mounted display according to claim 3, wherein when the ratio detected by the ratio detection unit is equal to or greater than a predetermined threshold, the display device displays the image by the different method. 11. .
11. The field sequential method is a method of switching and outputting RGB light in a time division manner, and the separate method is a method of outputting any light of RGB. The head mounted display in any one.
The field sequential method is a method of switching and outputting RGB light in a time division manner,
The head-mounted display according to claim 3, wherein the different method is a method of simultaneously outputting RGB light.
A display unit having a display element for displaying a color image by controlling the output timing of RGB light;
A member for mounting the display unit on a user's head, the mounting unit having an adjustment unit capable of adjusting the position of the display unit with respect to the user's eyes;
Position detecting means for detecting a positional relationship between the user's eye and the display unit;
Control means for displaying an image on the display element in a first method or a second method in which output timings of RGB light are different from each other according to the positional relationship detected by the position detection unit;
The first method is a method of outputting RGB light by switching in a first cycle in a time division manner,
The head mounted display is characterized in that the second method is a method of switching and outputting RGB light at a second period shorter than the first period in a time division manner.